I'm running a 3600 lb(with driver) Polara street/strip car, 505 stroker , 10.5 to 1, Indy Max Wedge ported heads, solid roller.635 lift, 4500 stall converter, 28"tall M/T drag slicks, and 3.73 gears,
The car runs 10.50's at 129 mph...60 foot is 1.53.
I would suggest that you try those 3.91 gears...