What gear for 6K in 1/4 mile?

3000# car with 340 +.030
10-1 comp. ratio
.500 lift cam with 230*@ .050
stock X heads
Air Gap with 750 Demon
904 with low 1st gear
2500 stall convertor
275-60-15 Drag Radial
What rearend gear to go thru the traps at 6K in 1/4 mile? Thanks, Brad.