4.10's or 4.30's for 8 3/4 gear swap

You want to gear for a little past peak horsepower at the stripe. I'm guessing peak power to be around 6500 at most. So you're falling a little in the middle. I think I'd go with 4.10s myself knowing the car is light. Make sure the convertor is very high quality, and I'd also go another 500rpm higher on the flash stall. I think your looking at a torque peak around 4800 depening on how the heads flow.