When I bought one about 15 or so years ago, it came with the original Carter SD 4-barrel. WAAAAAAAY too big for the street.
I had access to both the factory 4-GC and the Carter 9400s AFB. Opted to use the 9400s, with good results.
Today, both are available BUT: the 9400s is expensive, and the original Rochester even more so.
The original Rochester has the advantage of being original for car shows and estate sales. The Carter has the advantage of the Carter Strip Kit, although these are not as common as they once were.
Jon.
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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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