Additional carb info:
There are 2 aftermarket manifolds for these enignes.
1. The common Edlebrock intake. It offers 2 intake tops, one for the stock 82 - 85 Rochester, the other top is for a Holley 4 barrel.
2. Offenhauser makes a "Daul Port" 4 barrel intake which is VERY rare.
I don't know how welll this works, I have never used it.
Check this out:
Here's a third option:
Tunnel ram intake. Probably not too good for a street driven truck.
Anyway, you get the idea.
There are other combinations. They mostly use a 4 barrel intake, but then use a fuel injection system that is stand alone and uses a Holley "Pro-jection" or similar bolt on system. These are totally tuneable by the user.
I guess I'm going into the high end performance which of course means big $$.
I think someone on the forum used the Edelbrock intake and ran the TBI by adapting it to the manifold. That may offer another alternative by keeping the TBI.
A few additional intake options:
Weber 38/38 Outlaw carb mounted on a stock or better yet... Edelbrock intake.
You can also use a 32/36 Weber on the stock or Edelbrock intake. This carb will give good fuel mileage, but will somewhat limit higher power output.
Here is a one off custom intake for 3 Weber 2 barrel downdrafts:
I will have to custom machine alot of parts to make this work. I have never seen another like it.