[Mike S]

I have a 67 but basically the same suspension. I do have an automatic and launch with a trans brake. I always had a tuff time hooking slicks consistently. I switched to 315 radial and have no problem now with no changes to my suspension. It usually has 1.34 60's and traps at 133 for 10.00.
All stock suspension but aftermarket arm. I have them in stock mounting location except for the back of the lower bar, it is lowered 1" on the rearend. Double adjustable on the back, set at 6r/14c. 150lb springs. I have the car as low as I can get it. Up front is all stock including the front shocks.
I have 4.10 gears and weight 3500lbs. Launch at 3800.

I add weight to the trunk to slow the car up and found the more weight I add the better the 60'. My last race I had 300lbs in the trunk and had a 1.32 60' to go 10.00. With no weight it will 60' 1.29.
Might be a band aid but add 100lbs as far back as you can get it.