If the converter is correct with the combination, foot brake or trans brake the car should 60 foot pretty close to identical times.
Same with changing starting line rpm's. Should have very little if any effect.
Changing staging rpm will effect your reaction times though.

69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, low 10.30’s 1/4
1.41 best 60 foot
6.56 at 104.17