Finally the decision has been made.

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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
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
 
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
I'm gonna be running a thermoquad its listed at 850cfm but who knows how they rated them back then compared to now.
 
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