More ignition advance needed in my opinion. Try bumping it up to 18 or 20 degrees initial and see what happens. 34 total is also too little. I suggest at least 36 degrees, but 38 degrees or even more are probably better. Maybe need too adjust the advance curve in the distributor. A vacuum advance would help also.
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 Street/strip 1969 TA clone. Back halfed. 3300lbs. Twin turbo LSX 387cu. JW glide. Holley Dominator EFI. E85. Street driven.
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