Finally the decision has been made.

Nat said

i ran a 670 holley on my 340 it was enough for the street at the track could have used a bit more at the top end maybe a 750 would have helped a touch

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Yeah they're calibrated lean. Theyre a loser on the top end.

A/f gauge hooked up, at wot 4000 and up, 14's to 1 lean. Jets dont change its it's the bleeds/pvr