Quote:
Originally Posted by johnjzjz
its the size of the throttle blades that determine the size - with the venturi - 650 / 750 does it matter for what you need the smaller one will get better fuel mileage -- we put 750s on 454 cars all the time to make them run better and get more mileage -- jz
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Somewhere I have a PDF from Holley that lists carb sizes with venturi sizes. I will see if I can dig it up and maybe you can cross reference it. I had to do that when I bought a Holley with the choke horn (and thus list number) milled off.