I don't have any of my books here, and, I'm no expert, but I believe the lower HP cars would come with the Quadrajet(Rochester) carb.
Either way, would that really be a reason to NOT purchase the vehicle, if everything else checks out? GM didn't keep all that good records, and engineering changes were done on a daily basis, so it is entirely
possible that one 250hp car could have the Quad carb, and the next 250hp car on the line would have the Holley. Not that it happened, but it definitely possible.
If it were me, I wouldn't worry too much about the authenticity of the carb/intake, if the rest of the car is honest, and the price is right. You can locate carbs/intakes to be "correct", if that's what you want to do after the purchase. I just wouldn't want to miss out on "the" car, just because it
may have an intake/carb combo that might not be original to the car.
Mike is totally right, too....there are many Corvettes that do not pass NCRS/Bloomington Judging due to a discrepancy in the book(s), and what is on the car, but....they are looking for what is known to be a "normal" production item/combo. If there is
proof that a car came a certain way from the factory, the the NCRS/Bloomington standards would be waived for that vehicle.
My '74 has an "incorrect" dated smog pump, but since there is proof that it sat on the assy line during a strike, the date is acceptable as "original factory equipped".
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Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"