1st off your babying the car to death...
try leaving harder....3,000 to 3,500...
also your short shifting the car....that motor most likely needs to turn a minimum of 6500 rpm to make good power
My wifes car runs 7.50/7.60's at 91 mph...3300 lbs, 406 steel head small block, 12 bolt 4.56 gear 26x10's,,on MT DOT street tires...520 flat tappet cam...and foot braking..350 turbo tranny with 3500 TCI stall.
much like your car excpet we are driving it much harder .....thats where your 2 tenths lie in my opinion.
your car still seems a little heavy with all that fiberglass you have..you sure your weight is correct ?
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "