1968 FB B'cuda, 030 340, 11:01 comp. heavily worked T/A heads 202/160, Hughes solid cam, 245/250- 560/575, Edy street tunnelram with 600 vac. sec. holleys, 4 speed. I plan on using a Centerforce dual friction clutch, S/S springs and a 27" 0r 28" tall tire. My question is gear ratio. right now...