Et street radials on a 4 speed ?

I have some 325/50-15 BFG drag radials. Street suspension. No SS. No traction aids.About 425 Hp, 3.09/Direct box with a GearVendor O/D. Gears I have tried:3.55,3.91,4.30,4.89,5.15. All 60 ft @ 1.9 to 2.1 and mph at about 7.9/eighth.
So Im none too happy with those results. Like I said tho;street suspension. They spin most of the way through the eighth on our crappy airplane landing strip of a track.
As a sidenote; I rented them out to a guy with a Coronet with a hot 440 Automagic and a small NOs plate.On a different track, he loved them. No results available.