I use to have both types of M/T ET Street and ET Street Radials of the same size, 325x60x15 on the radials, the radials didn't hook worth a hoot on the street, the bias ply where way better on the street
The radials where quicker and faster at a decent hooking track, not good at all on any semi slippery surface like most streets around here
As far as rear gear ratio I tried 3.73, 3.91, 4.10 and 4.30 in my old pump gas Duster, almost no noticeable differences other than spending more time in high gear at 1/4 tracks with the 4.10 and 4.30
That motor started off as a 511 C.I. with 9.25 to 1 compression with big valve slightly ported 906 heads and ended up at 517 CI. by increasing the stroke from 4.25 with -.026 piston deck height to zero deck height with a 4.300 stroke crankshaft, which increase the compression ratio to 10.29 to 1
I really like that car, it far exceeded my expectations 9.993 at 134.7 MPH cork up with the full 3.0 exhaust system and air cleaner weighing 3450 Lbs. with me in it