How are you gonna deal with the massive tirespin that even 280hp brings?
A streeter with street gears, and an automatic transmission is a two gear/one shift car.
With 3.91s and a 5500 shift, your speeds at the shift are about;
42/71/103. When you shift into Second at 42mph (no tirespin) the Rs will fall to about 3250, with a typical street stall. What good will your 500@5000/5500rpm engine be, at 3250? You won't get to the power peak again until say 5000/65mph. Which is good gearing, but the tirespin will kill your ET. You might as well have half the power ...... and not have to deal with as much tirespin.Jus saying