Just looking for some info on what final drive to put in my 5 for drag racing so i can cross the line in 4th at 8000k or lower

with the standard box iam crossing the line at 8600 in 4th but sometimes clip the limiter

 

they say with the stroker the best gear to go with is 4:10's, im sure with the 5 tho.

 

I was looking at Mfactorys 4.00 has anyone ever used one here