More Tracks R Going 1/8 How to gear a low HP Car??

My Dart runs 7.20 in the 1/8th... 11.50 in the 1/4 on purpose.. car is slowed down to run 11.50s / 7.20s. 3150 lb Dart 408 small block, 904, 4.30 gears going thru traps (1/4 ) at 6300. went from a 4.10 to a 4.30 gear.. no difference 60 fts. still 1.49-1.51 foot braking

What MPH on the top end of an 1/8th? Always foot braked and was talking 1987.

Protrac Street radials.

With full exhaust and cast Iron!