Want it to go faster, work on the 60' as it's REALLY soft. You've got a 12.00-12.20 MPH in a 14.00 chassis... 14.00 cars go 1.95 60's. You should be in the very low 1.7x range or even high 1.6x for that MPH if the chassis is good.

Gears won't do much when the chassis and converter aren't helping you at all.

I'd spend money on a good converter that flashes at least 3500. That will wake it up a bunch! New converters aren't the marshmellows of the old days either.