I have a 1968 Chevelle with a 383 Stroker motor I am puting in it. It has a 5, 18 lift cam, a set up heads with 76cc to drop the compression from 11:1 to 10:1. A 1500 RPM High-Rise Airgap intake. I have a TH350 Tranny with a 3,500 Stall. But I have a stock rearend. I am interested in puting in a Positraction rear end. But I am uncertain of what gears to have. The car is mainly used for in-town and highway driving. Off the top of my head, I believe I have 15 in rims, and 245 tires. I was thinking 3.73 gears, because I heard it is a good middle for both performance on highways as well as accelerating from 0.