Not Ranked
Ssnake & Excal,
IMHO, forget the 660's and contact Phil Molski at PMR Racing, 860 828 8828.
I have a pair of 3310, 600's which Phil massaged to 654's [using his flow bench] and modified extensively. They carburate perfectly throughout the fuel curve and Excal, I run your numbers at the track. Did I mention mine are vacuum secondaries? My jets are 65's and PV's are 3.5.
Just ask ERA-FIA about Phil's carb tunes.
Good luck,
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Chas.
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