What size and type M/T radials are you using now? what width wheels also?
I ran the M/T 315x60x15 ET Street Radials on my old pump gas Duster on both 10 inch and 12 inch wide rims, those tires worked great on a good track, not worth a hoot on the street or on a mediocre track I ran from 18.0 to 22.5 lbs. in them.
I also had a set of M/T ET Street bias plys of the same size, width and circumference on similar rims, they worked a bunch better on bad tracks and on the street I ran from 9.0 to 12.0 lbs. on them, the best 60 Ft was 1.42 on the radials and around 1.47 on the bias plys
That car weighed 3450 lbs with me in it and the best ET and MPH was 9.993 at 134.7 MPH at Woodburn dragstrip in late August or mid September, CRS disease now
That car had a 518 C.I. pump gas 400 block stroker motor with a set of Indy SR M.W. heads, Indy 400-3 intake with a Holley 1050 CFM Dominator carb, MSD 7 ignition, 727 with a Mopar helical cut 2.77 low gear set, T/A 069J 4200 SS Hemi converter and 4.10 Dana 60 on ladder bars with double adjustable Strange coil over with 15 inches extended length and right at 7.0 inches of travel, I used a set of 150 Lb. rated coil overs on them also
That car would hook in a mud puddle in the middle of a rain storm