Help on 340 combo

Is your car spinning?

FWIW, my stock springs sit almost flat as well, and I have comp engineering 90/10 shocks up front with their 50/50 shock on the rear. I keep the pinion snubber about 1/2 inch off the body (or less). My car runs 1.49 60' times with this setup, hanging the hoops about a foot off the ground.

Judging from you MPH, I think you are down on power. Like others have said, I would start by degreeing the cam, check compression, get a looser converter, etc.