Richard/Tech1, Thanks. By that check it is indeed an 8" and one more indication that the ratio is 3.55:1, so I have the right set of speedometer gears. Thanks. (The unheated garage was OK for a quick check on the rear bolts, but it seems that the warm weather is gone for now and too cold to work in the garage even with a small heater. Anyway I think I made a good move to get the engine, trans and rear upgrade done by a shop. and I will assume I have a 3.55 rear gear.)

Don Shillady
Retired Scientist/teen rodder