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What kind of ignition are you running. According to the folks at Barry Grant, a high power ignition system such as a MSD will leave the plugs a lot cleaner than with a stock ignition. Go check their website BGfuel.com or something like that. Truly the best way to tell is to get on a dyno with an EGT sensor.
I have a 351W crate motor and run the Holley 9379. I have play with the jets quite a bit. Surprisingly, the stock jets work the best for overall performance 68F, 81R. Car does run faster in the 1/4 with bigger jets, but is rich on the street.
Also, do not forget about the other circuits: idle, power enrichment. A carb can idel fat as hell but be extremely lean under WOT. It can be very confusing and frustrating. Get a Holley or BG tuning manual at the book store.
Curt
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