I can tell you when my alternator fried and I was low on voltage it would pop through the carb as well. When you ran the car without the alternator did you use just the battery?
I'm using a HEI with a internal 50k v coil and a Digital 6+.
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5.3L LSx, Fbody .500 cam, TH400, 4500 Stall, Moser 9"
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