First of all the 85 is a fuel injected engine, You can not put a carburetor on a fuel injected intake manifold it won't even fit.
And if you put a carbureted intake on it you will need to change the elect fuel pump in the tank, the distributor and you will need to DRILL out the 4 center bolt holes in the intake manifold too. Plane and simple THE ENGINE WON'T RUN WORTH A...................D...M need to keep it fuel injected.
I've had good luck with the Edelbrock 1406 right out of the box.
There is no reason you would have to.
No. Just a standard 305 with a 2 barrel carburetor.
intake manifold is DIFFERENT for models 1985 and 1988
yes
17-22 Hg
That's what the gas pedal does.
The 1989 Chevy Caprice 305 V8 does not have a carburetor. It is equipped with Throttle Body Fuel Injection which may look like a carburetor but is not.
If it's a carburetor version, there probably isn't a regulator.
600 cfm will be enough for that engine.
ABOUT 1,000
The carburetor needs rebuilding including a new float, needle and seat, assuming it has a carburetor.