Suggestion on New 3rd Member

I would go with a 4.56. I think with the 3.91 and no traction you should still run faster than an 8.70. My car has alot milder motor than yours just a 360 with mopar 292/508 cam, set of 587 heads with 2.02 1.60 valves and 4 speed. I am running a 3.55 gear right now, never had it to the track, but did race an 84 Camaro with a built 355, and he had 4.56 gears he runs consistant 8.50's. I beat him by about 1 car lenght in the 1/8th. Your car should be faster than mine.