What does it do under load at full throttle? Does it still put out black smoke as it accellerates down the quarter mile wide open? Might just need another 1/4 turn in on the idle mixture screws. Vacuum secondaries are usually pretty forgiving as to carb size.
Rev
------------------
'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
|