Don't take a break, just get out to the next T&T and get some numbers. Might not feel faster at this point with some street testing, but I think you'll be surprised how much you'll really pick up at the track with those heads. I'd be looking for the MPH numbers.....That will show what kind of power the new engine is really making. Once that's established, you can tune from there. I agree that deep in the 13's is achievable at this point, and maybe beyond that depending on how efficient the torque converter is.