top speed with a 4.10?
http://www.f-body.org/gears/
using 6000 rpm limit, 3.23 OR 2.73 gears, 26" tall tire
*edit* found some ratios.....
1st 3.06
2nd 1.75
3rd 1.00
4th 0.70
with 3.23 144mph @ 6000 in 3rd
with 4.10 113mph @ 6000 in 3rd
A good bolt on car will be nearly maxing out his rpm, you may need a taller tire or extend the rpm
On a side note 4.10's are going to be a bit much.


