William, thanks for the reply. In your opinion what 1st gear ratio would be best? 2.52 or Lower? I really don't drive the car on the highways and would like the torque off the line. Your thoughts?
All vintage 4-speeds are 1.00:1 in 4th. All the same on the highway.
'Peaky' engines like the Z/28 need close ratios to keep the engine in its narrow power band. The wide has a 2.52:1 1st gear for a total of 9.4:1 with a 3.73 axle. But you pay for it in the 3-4 shift; the engine will drop from 6500 to 4500 and it feels like a stiff headwind. Your 383 will have a broad power band and the drop won't be as noticeable. Don't think the 383 needs to wind that far anyways.
Another factor is the torque the Muncie trans was designed to withstand. A wide has more multiplication and your 383
could be near the ragged edge for a Muncie.