How much difference will it make?

I kinda think I know the answer, but thinking I know usually bites me in the ***. When I set my suspension up initially I had never drag raced and did not have that in mind.
I have 1.03" torsion bars up front, 1-7/8" front sway bar, 7/8" rear sway bar and Bilstien RCD shocks. I have 002/003 Super Stock springs out back.
My drivetrain consists of a 318 with Summit K6901 cam, Performer 318/360 intake, 750 DP carb from QFT, Headers and full dual 2.5" exhaust. I run an A-500 OD auto with an 8-3/4" rear (4.10 sg).
The car is a 74 Duster, at least 3200 lbs with 275-60-15 Nitto NT555R drag radials. I tried the tires at 20 psi and at 18 psi and found no difference.
I spin off the line regardless how I launch it. I tried getting up on the converter against the foot brake as much as possible (maybe 2300), it tried 1500, I tried from idle and it always spins. 60' times from 2.2 to 2.3.
Where should I start? I am thinking shocks first. I know the rear A body length shocks are a problem with the SS springs. Do I need to ditch my sway bars and heavy torsion bars? I really like how it handles as is but out here In the prairies there are no canyon roads to speak of.
Thoughts?

Cley
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Do you have a pinion snubber? What is the Stall on your converter?