what do I need to swap a 300 to a 351w. Im keeping the carb from a 83, and using the mazda trans from from the 92 bronco

 

Whatt vehicle is it going into? Also so you're goal is a carbed 351w with a 5 spd. Correct. Well the engine mounts and towers need swapped. If its going into a previusly fuel injected 92 you will prolly have a number of electrical issues to fix.

 

Going backwards... too much to detail and too tedious to think about. Suffices to say you can just start yanking most of the electrical out because its not going to do you any good. Depending upon what ignition system you plan on using, you could need very little or you could need a harness for something as unreliable/prone to sudden inexplicable failures as a Duraspark or EEC-III (even rarer and more difficult to troubleshoot) system. But if you are going backwards you may as well go all the way back to points/condenser/vacuum advance so as to simplify things even further.

You will need 351 mounts for the model year of the frame you are going into. Flywheel for the 351. Radiator to handle the additional 51 cubes.

If you are parting with an EFI 300 complete with harness and computer, let me know, My brother is looking for one for his '76 Bronco.

 

the problem is electrical, between the fuel pump and the comp, it will run for a week and i have to replace the computer again, just trying to get back to something i can understand

 

sounds like you have a grounding issue. you would be better off selling what you have and getting a bronco with a 5.8 already in it.

the 300-6 is a great motor and honestly shouldnt be swapped out for anything in my opinion. they are not a very common setup so keep them intact.

 

I know, I have another 300 (carbed) but, it ant nothing like the efi, I had to order this bronco its a custom. but I love that truck, I bought it when I got back from the war, and Im gunna keep it running, one way or the other

 

Thank you for serving, Guys, or gals like you let me drive my Bronco the way i want!!!

 

I'm going with the GM HEI on a Ford dist. sold by jegs

 

See there's the problem. A GM part on a ford motor...

It does.sound like a fairly simple (but PITA to find) problem.

What makes you say fuel pump. You said you're replacing the computer freqeuntly...

 

its between the fuel pump and comp, the last comp said the tank was showing no fuel, the one before it showed a full tank, no this engine is all Ford I am going with the new dist. to bypass all the efi, none gave me a reply on the post about the electrical problem, i would love to keep the set up i have now, she has gave me 470,000 miles

 

Have you checked or replaced the fuel level sending unit/float? I don't think the comp is directly controlling the fuel gauge. I have been wrong before tho.

 

the computer doesnt take any info from the fuel tank. Now if the fuel pump wasnt producing the proper fuel pressure it could cause issue but again that isnt controlled by the computer but by vacume.

 

i tried to check the wires, but the diagram and actual wires are not the same, i was going to hot wire it, but i dont want to if i dont know what one is hot

 

Just test it with a meter with the key on. That should tell hot wire. You made sure you have the correct diagram first?