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Ed Cunneen's book also includes the story about the AHRA incident, exactly as stated above. The 4296 carb was the one spec'd out for the ZL1.
According to Ed, the first 52 ZL1s and all L-72 cars came with the 780 Carb (p/n 3959164GE). The ZL1 cars got the 780 due to short supply from Holley.
Gibb then got a shipment of the 850s and they were swapped out.
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What an amazing topic this has turned out to be. Since the
majority of the ZL-1's came with 4346's, as you both have
clearly pointed out
, why do the Holley part books
list the 4296 as the original carburetor? Obviously, if
they were not shipped in time for assembly, how could they
technically be the correct carburetor?
If the vent tube on the lower side of the ZL/2 setup was a
clearance problem, you would think that Chevy engineers
would have Mickey-Moused a clearance tube, wouldn't you?
Steve