A 600 is too big IMO. I have a 500 CFM 1404 Edelbrock on it and I have it leaned out just about as far as possible, and it could go a bit more but I'd need to have metering rods make for me. I looked for a cheap 390 to try out, but all the cheap ones were junk. I am going to try the Q-Jet out this summer.
Love Old '67-'72 GM Pickups! Dare to be different.....Running GM Inliners, GMC's MONSTER V-6's, and real inline power, Cummins, in Central PA.
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