Best setup for 60'

I have a 408 73 Duster, 727 with a 4200 9.5" dynamic convertor. I have KYB's on the front, and SS springs, no snubber, and Mopar long extension shocks on the rear, into a 3.73 Dana. My best 60 times come with stabbing off idle. If I warm up the tires properly, I have no spin, it hooks and goes. I actually gotr lower 60' times with 295-45-17 MT Street than with the 28" 10.5 slicks I had, because of the lower gearing. Neither spun off the line.

My best 60' is 1.639, average is around 1.66. With the 1.639, I have a best 1/4 is 12.09 @ 110. I need more compression!

Try stabbing off idle, and also loading the converter to it's max.

Not sure shocks, etc. would help if you have no spin. Interestingly enough, the SS springs were so firm I get very little axle wrap and no hop, and have not bothered with a snubber, as my dana did not have provisions. A couple of racers I talked to confirmed this.