I have a cheap holley 600, electric choke, single pumper, single metering block, and a similar setup. It works good. However I would like a 650, but I can't prove it to be better yet. I think a 750 might be to big for street torquem, however might be good for track.
I would try a 650. However my time is from 600 and I have good street ability.
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82 Mercury Capri 302.
Comp. Cams
Tremec 3550
3.73's
12.8@106 N/A
Kevin's Capri