I have a 6spd mustang I just bought with a kenne bell 2.8 it made 630 rwp and is turned down to 580 for steet also has 373s will put drag radials on it just kinda curious.
The 3.73 are gonna hurt you cause you will have to hit 5th in the quarter. But with a decent 60ft and hitting 5th good you should be low 11s maybe high tens. Depends on a lot of stuff tho da, suspension, driver mod, track prep, I mean its not just a you can do tens cause you have 600hp it deals with everything.