I am sort of in the same boat. I am about to buy new gears and don't know what to buy. I only run 1/8 mile. I was running 4.56 with my 30 inch tall drag radials and it was not turning but a little above 6000 at the finish line. I could probably go through in second. I would like to turn around 7000 at the finish line. My motor made peak HP at 7300 on the Dyno. It is a 3.79 stroke 340. (394 ci). Any ideas ?

1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...