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That is a Rochester carburetor--4 barrel, and these carburetor are notorious for
problems. It's a hassle to repair because some of the flat plug in the passage
ways will leak. We just drill them out, and install new plug with epoxy after
the carburetor body has been thoroughly cleaned. Go to you local library they
should have a repair manual on Rochester carburetors, or look on the Internet it
has everything in it networking. GB...stewbsion
Check that on your carburetor, when you press on the throttle, it still shoots a little bit of gas out into the barrel. If it does not, you may need to replace the throttle pump. what is happening is this: As the throttle is opened higher, the vacuum drops severely, and the fuel doesn't get put in. The throttle pump pushes a little squirt to retain the vacuum. If it is an EFI unit, you have other issues, that I would recommend a mechanic for.
it would be easier to buy the adapter but holley al;so makes intake manifold for this problem they are pricey but you get the full 600cfms with an adapter you wont get as much oomph out of it but and adapter is a good idea especially when you dont have 300 to blow on the manifold