MY dyno and ET slip, What do they tell you?

IF you go with a 28" tyre and 4.11s, my guess is you're not going to cross the tape at much above 6000 with a SB stroker and that MPH

I say this because I know of a 408 (3300lbs) running OOTB eddies with 1.6 rockers, and a similar cam, 3.89 gears, 27" tyre that runs 11.2s at 120mph and crosses at appx 5800.

Your trap RPM using MPH and tyre size can be verified here -

http://www.wallaceracing.com/gear-speed.php

http://www.wallaceracing.com/calcmph.php

ATM your crossing at around 6400rpm (using the MPH and 26" tyre provided) - It may be it's already stopped pulling b4 you trap it?