FWIW, the only difference between the Edelbrock 500cfm and 600cfm carbs are the jets/metering rods and accelerator pump nozzle (on the 1406). No worries to lean out a 600cfm with the 500 cfm tuning kit. They also sell an even smaller pump nozzle.

Unless you're dong a cam change, I recommend a dual plane manifold vs. single plane. My 300 with an Offy C runs pretty well but I sure wouldn't mind having the dual plane's extra oomph down low.

 

well here are my thoughts:

should my 81 resto survive carlisle ATNs (i.e. not be bought from me) then I am looking at a hop up.

I was thinking:

use EFI manifolds and route the air pump output into the O2S bung. that should feed the cat.

Use the offy DP with the holley 390 and grab some EGR gas from the bung on the back of the 2nd y-manifold, and plumb into an EFI EGR valve (non-transducer type) and bolt this to the EGR mount from the original intake,sawed off, and plumbed into the area under the carb - the plenum area by drilling a hole for 3/4npt and threading in pipe and putting threads in the sawed off egr mount.

then run voltage to the EVP and read the output with a tiny digital counter under the dash so I can tell its working and perform any restrictions etc to tune it.

viable?

 

just go to the junk yard and get a egr spacer plate off an 80- 85 v8 mustang. your going to need a spacer plate anyway, just use that, it has the egr on it, then plumb it like you were talk ing about before.

 

ok 80-85 stangs had a 2bbl or 4bbl option (83-85 was a 4bbl?) I assume I need the 4bbl one?

 

yeah, 4bbl spacer plate, has the egr faceing firewall, on the spacer.going to have to drill and tap for the exhaust pipe to go to it, the intake on 302 provided the exhaust, shouldn't be a big deal, good part is that would give you the heated spacer, you need for winter use, to keep the carb from freezing up

 

i want to get rid of egr and everything emissions. so should i just mount the carb right on the manifold and do away with the egr spacer plate, or will this not work. carb and motor, no added junk/ vac lines just basic basic basic.

 

also dustybumpers is your truck a 2wd or 4wd. the reason i ask is the heddman headers are 170 from summit for 2wd but 4wd are almost 500. whats the big difference with the heddmans work on my 4wd??

 

The only reason you would want the egr in these situations would be for looks to pass smog, which I doubt it will pass smog with all the other modifications. You would have detonation and combustion chamber heat problems with the stock lean jetted carb, but with these aftermarket carbs, they are jetted rich enough where you do not need the egr anymore. And that's were a lot of the seat-of-the-pants power is coming from. More airflow and getting rid of the emissions tune dist and carb of the original engine is what the difference is.

Someone was asking is it worth it? I have never modified a Ford six, but from all the posts we get of these great engines not running because of the computer and emissions failing, I don't think some of you have a choice. You can either hunt and peck around the junkyards for a old wore out carb and dist setup to get it running again, or go the aftermarket hotrod route with the intake and 2 or 4bbl carb setup.

And you know, I run 600cfm holleys on my 302's all the time. You would not want a carb to act better than they do on these engines. I know the 300 is a different animal, but 300 cubic inches sure is close to 302 cubic inches.

 

you still have to run a spccer plate, the linkage won't cleat the intake I have the mod vac for the c6, vac advance, pcv, and the booster

 

so i got my holley 4 brl carb (390cfm) hooker headers, and clifford intake. Im ready to tear down. SO what else do i need now. Dist, ign module.
will the dist off of a 80 f150-350 truck work with vac adv. also do i have to get the ign module too off a older truck. I just spent a good deal of dough and i dont want the little things to screw it up. Help me out guys with what else i need.

will a msd 6a take place of the stock ign module???

 

any help guys??

 

i dont know but i'd guess so, someone should tell u for sure in a hour or two... keep us posted and rember we like pictures!

 

yes the dizzy will fit,plus the duraspark II ign module will work.you just need the harness that goes from the module to the dizzy.you will have to get this from a jy ,or painless wiring makes one ,but they are costly.the power end of the module should be on your truck,and be plug and play.

the duraspark II is a good ign module you don't need the msd.

 

so if i get a dizzy, ign module, and coil, for a 80 f150-350, i have to get the wiring harness too, Why wont my harness plug into it. What doesnt fit the connector on the dist is diff?? im new to fords so bare with me. how do i know what harness to get off a jy truck. is there something to look for so i know its the right one?? thanks

 

heres what the connectors look like.the first pic is the dist connector
the second pic is the harnes between the dist and ign module.
the third pid is the power wire for the module