If you still have them, I’d start by putting the old tires back on.

Cal Tracs didn’t make my car any quicker, but it was consistently good.

I ran normal rear springs(xhd) with mine, CE shocks on all corners, bottom hole, almost no preload.
1.51 60’ @3670lbs with a 383(typically 1.54-1.57).
9x30 Hoosier radial slicks, 20-21psi.