I had a set on my 496 low deck stroker...ported first by Muscle Motors on my stock stroke 440..went 5.28 in the 1/8 on my dragster...built my low deck and had them re-ported by a local small block chevy "expert" (I know, I know)...they then went 4.86 at 140 in the same dragster with the addition of a roller cam (old 440 was a flat tappet) the stock block engine made 782hp on the dyno. So I guess I am happy with my stage VI's. My

1968 Plymouth GTX
1974 Dodge P/U Long Bed Stepside 318
2019 Ram 2500 6.4, auto, 4WD