with an engine like this, wouldn't think you'd need a 4.56 gear to run some decent numbers...though 4.56's aren't a horrid choice either. 4.30 would seem perfect for the number of cubic inches/cam/trans.

I'd think a car like this could run mid 10's fairly safely w/ good traction, good driver.

1979 Dodge Lil' Red Express - 360 rwhp, 13.2 @ 103mph
1968 Coronet: 318, 2.76, 15.2 @ 92mph! (SOLD)
1976 Valiant: 360, 3.90, 12.90 @ 106 (SOLD)
1989 Shelby CSX #500/500