with 4.10's and a 28" tall tire with the 4 speed, my 365 trapped around 5700rpms, so im thinking you might be close to that as well since your tire is an inch smaller and you have 3.91's.

Also, not sure what tire you are running or how you are going to launch, but you should definitely be doing atleast 11.70's imo...My 3400lb pig ran 11.80's at 116 with horrible 60' foot times- could have had an 11.70 outta it with better hook, but it broke...oh,and my motor was making at most I think 450 at the crank

good luck man!