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Originally Posted by BZR77CHEVY
on a 305 a 750 holley is going to be too much carb. You'll do much better with a 600, or I think they even have a 480 or 500cfm. That said you'll probably still need to play around with the jet sizes cutting them back to .055 or possibly smaller. If I remember correct my 350's holley 600 is running .060 jets down from the .067's that it came with and it's still using a little too much gas.
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Umm, Not to start any arguments, but you DO realize the E4ME Rochester flows 780 SCFM @ 28" H²O, right? The beauty is that with proper AV spring windup and pull-off adjustment, the Rochester will tailor flow to load more appropriately than the Holley, which most likely comes out of the box more closely tuned to a 350 CID engine. It will work equally well on a 283 or 502 BBC.
What's more important here is that the E4ME has a far better vacuum signal than most out-of-the-box 4150s or 4160s, and unless you are willing to spend a week exchanging venturi pods in the Holley, rejetting multiple times, adjusting the float every time, tweaking idle mixture rates, adjusting to compensate for the poor (too rich) transition circuit in the Holley for a 305, swapping power valves and secondary AV springs, etcetera, you'd be better off staying with the Rochester.
This doesn't even consider the fact that the E4ME already has the necessary TPS so the ECM can operate, and the MC solenoid to enable the Rochester to maintain correct emissions AND get better fuel mileage. If you want to out-power the Holley, switch to a different secondary metering rod hanger and DR rods in the Rochester. It's a lot easier, and a lot more sophisticated design tha the generic 4150.
Just my 2¢