Had super stock springs on a 3350 pound Duster. Not minitubbed.
Ran CE 3 ways all around. Car ran 9.80’s and was ultra consistent anywhere.

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, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8