Jon at the Carb shop also said to try turning in the idle screws and go to a richer jet before drilling anything or changing the springs. I will try with 74 or 76 main jets and see if that helps before doing anything else.
The carb is a NOS '71 2bbl 455 carb - factory setting out of the box was 61 jets and idle screws 2.5-3 turns out!
I think I will like this large center carb - as is, it gets rubber in first gear and some of second just on the center carb alone. And that is with huge 275/60/15 tires.
Am not sure if my smaller stock '65 center carb would do that - but it would be interesting to do a back to back test of both.
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