nadmik, the 1965 4-barrel manifold was used with a Carter AFB (square-bore design). The Q-Jet is a spread-bore design. They don't mix. Either use the early manifold with the original carb; or with a small 400 to 500 CFM square-bore; or change the manifold if you wish to use the Q-Jet. If you go in favor of the Q-Jet, I personally like the O.E.M. 1968 or 1969 Pontiac cast iron boat anchor (eh, manifold). Others here may recommend one of the aluminum aftermarket units. Whichever, make sure the manifold and carburetor are matched, and match your heads. The spread-bore to square-bore (and vice-versa) adapters should be avoided. If you go with the early manifold, the easiest route (not necessarily the least expensive) would be the original 4-barrel from the engine you are trying to duplicate. This way original linkage, fuel line, and air cleaner all fit. Either an aftermarket AFB or a Q-Jet will require a different air cleaner (the original was 4 3/4 inch air intake, the others are 5 1/8), fabricating a fuel line (not difficult), and possibly rerouting linkage (again, not overly difficult). Jon.
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Good carburetion is fuelish hot air.
[This message has been edited by carbking (edited 11-27-2000).]
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"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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