Best guess on 416 motor

I'll add that we're right at 7,000 at the stripe with a calcualted 3.7% converter slippage.

I, too would like to try 4.30's and MAYBE 4.10's at some point.

I will also say that if you already own the parts, go run it as is. One can NEVER predict what cam/gears/converters will amount to without some data (timeslips).