I was gonna say the same as pajeff02. Is the car an auto or stick shift trans? If auto, I would also add a stall converter (3000-3600 is a good street
Same as pajeff02 said. There are a lot of cheap belts out there. Get a goodyear gatorback belt and see what happens.
Not sure of your position on a budget, but I think now is the perfect time to upgrade to some high performance parts, or a completely higher performance
They have an F-body drop in engine. Not sure of all the details, but hit the link on the right side of the page, click the "Performance" tab,
A cam only with an LS6 intake, upgraded rockers, springs & pushrods, full exhaust and a tune? Not quite sure if that would get you there, but should