What distributor are you using, how is it set up as far as timing curve to full advance. Running lean may not be the only cause for the backfiring. I'd check the timing out before you start dumping time and money into the carb.
My .02
JB
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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