One of many popular choices. Still kinda torn on going eddy or summits branded 600 for the 390....... The summit carb has a few things I really like.

 

The Summit like Matthew/FE runs? Its the Autocraft?

 

The fuel injected head raised the compression ~ 0.5 points over the carbureted version. It also incorporated fast burn characteristics.

The tendency for "cracked heads" mentioned in another response was usually associated with having been over heated.

 

The heads you have can't be EFI if you have a carb on it, unless you have an adapter to (such as this AP-37 Intake Adapter Plate). The EFI heads are different regarding intake manifold mounting bolts/location and the ports are raised. The easiest way to tell what heads you have is by the casting number. What are your casting numbers?
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EDIT: Sorry, after re-reading this (and in the title) I realized you are building a 4.9L. My head is stuck in 7.5L world. I don't know anything about 4.9L engine efi heads. Disregard my post.

 

Good question; I can't seem to locate casting numbers. It was my understanding that the EFI heads had 16 intake bolt holes (instead of 13) and 'heart' shaped combustion chambers. My head is 16 bolt, heart shaped.

I'll take another look this afternoon

 

Tim - Go back and re-read CB's post. He edited it.

 

Saw that. I'm certain I have EFI heads.

I've been seeing responses RE Carb / Intake options. I'm wondering now that if I go with an Offenhauser if I need some sort of heat plate?

I'm getting conflicting information. I also heard there is a place on the intake to use hot air / exhaust manifold heat? Do I need to connect something or, since it's tied into the exhaust manifold, will simple convection be enough?

Confused now..

 

Update on the rebuild progress:

Got up this afternoon and got the crank and cam pulled. Down to the bare block now.
Taking Block, Head, Crank (w/gear) and Camshaft (w/gear & thrust plate still on it) to the Machine Shop on Monday. Once they do their thing, I'll know what I can re-use, what I need to get, etc.

Not really looking forward to the bill..

Camshaft had steel gears so that was a plus..

 

16 bolt holes on the intake/exhaust portion of the head, EFI head. The 13 that are used for a carb setup, are still in the same locations, just 3 more were added.

Heat plate is needed, if you plan to go with either EFI exhaust manifolds, or headers. If you plan to use the factory log style exhaust manifold, it has the heat system already in place.
EFI didn't use the same type of method for heating the intake, it had a heated throttle body. The carb setup has the intake/exhaust bolted together, with a heat transfer chamber built in.

EFI exhaust manifold give ~75% of the performance advantage of headers, without all the typical header "issues". But, you need to add some way to heat the intake. Some use a heated carb spacer, others make a heated plate to go on the bottom, where the exhaust manifold originally mounted.


Steel cam gear is a good sign that someone has been into the engine before. How deep is another question, but the machine shop should be able to provide some insight on that.

 

The Summit branded, Holley designed, carb. Yes, I believe that is what he is running.
Like this: http://www.summitracing.com/parts/su...00vs/overview/

Odd side note, the other mechanic at the shop, brought in one of the older Holley branded carbs of this style. Planning to rebuild it, and drop it on a 460 to replace an edelbrock......

 

If you're looking for aftermarket manifold options, looks like Clifford Manufacturing is still around. Haven't used anything from them in about 15-20 years, but they used to make an awesome 4 bbl intake for the 300

 

I got the block, head, crank and pistons w/rods to the machine shop today. Initial diagnosis is that the head and block are in good shape, as are the pistons. At this point, unless something changes, I'll be re-using the pistons. So just gaskets and seals, rings, new oil pump, rod and crank bearings and the new 260H cam (w/lifters and pushrods and new timing set)

Updating carb/intake thread with the latest info on that front..

 

Going to hone the cylinders to get the rings to seat?

 

Yes. He's checking to see if it needs bored, but in any case we'll hone the cylinders. Also checking the deck for flatness and will deal with that as needed.

After all the issues with intakes / heating intakes / etc I'm really leaning towards staying stock except for the 260h cam.

 

It is rare for a machine shop to say an engine doesn't need to be bored. They don't wear round and the only way to get them back round is to bore it. And that means new pistons.