Down in So Fla, Holley's are altitude sensitive and overpasses are altitude! Send the Autolite to Pony carbs w/ the engine specs and you won't find a better one. Jon will build it for your car. My old one got 20-22 MPG w/ a cam, headers, and my belief that if there are 4 holes, they should all be used! It has 170,000+ miles on it and Jon refurbished it @ 160K.
If it's a more race oriented car, and you don't mind occasionally having to tune the carb - Holley.
If it's a street driver, and you don't want to have to noodle with the carb - Autolite 4100. (Pony Carbs)
Of course correct carb sizing is pivotal to what sort of performance you ultimately get, so choose wisely. Dickson
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