I agree with the converter being an important key. I have one for my 727 that produced a stack of 1.34 60ft times at 5 different tracks. It got so good we had a right and left lane dial at one. Helped us go a ton of rounds. My other converter will result in faster ETs, and would dip into the high 1.2/low 1.3 60, but not consistent. Of course doing this on a 10” tire mid 9sec ride leaves something to be desired.

.....of course I changed intakes, went to a dominator AND set the 727 aside for a 904 so basically ruined a perfectly good bracket car