600 is a bit small for a 400. 750 is factory cfm rating on the q-jets but having a 750 q-jet is not the same as having a 750 anything else since it is variable as the secondaries may never open all the way on most motors that use it. You get a 750 q-jet on a small block chevy too.
I've rebuilt holleys and q-jets but I know absolutely nothing about an edelbrock.
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-Jeremy
1968 GTO 4-spd convertible, console, factory gauges, hidden headlights, 3.90:1 posi, AM/FM radio.
1962 Catalina convertible, Starlight black w maroon interior & white top.
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