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The headers would be the same anyway, so you can order headers for the 83 and be all set.
Well since a 427 is a Ford and the Car is a Chevy. It would be a safe bet that you are looking at Custom made Headers. Hope This Helps.
Yes you can. I'm doing it to mine. A cold air intake would also go along with it
I would say it all depends on your intake and exhaust system. I run mine with stock headers, nismo duel rai and 60mm invidia n1 exhaust...runs great with stock headers.. remember, just because it is aftermarket does not mean better...
without swaping heads or getting head work done your looking at approximatly 400 hp depending on the cam and intake and carb match.
somewhere between 280 and 320 hp.. depends on which intake and carb used. also the diameter of the header tubes and length of collector. A victor jr. intake with a 4779 Holley is a good pick. Also lose the HEI distributor. they are sloppy. Get a Mallory Uni Lite or similar. That intake and carb will do far better with a good camshaft--Properly degreed on installation.
around 220hp i would say
You would probably only get 5-10hp at the crank from installing both, depending on brand and other modifications.
get long tubes no matter what but hooker seems to be the way to go with those motors
not from the factory, that would be a customization
I think Hooker headers, Alston Cassis Works, and Art Morrison ent., all make kits to install that motor, that would come with everything you will need, from headers, to motor mounts, to frame connectors.
Assuming this is a 4.3L engine, the upper intake manifold gasket would be between the upper intake manifold and the lower intake manifold.