I have been going thru a similar endeavor with my A body, was being pressured to switch to a hybrid coilover like the QA1 stuff. I am already pretty vested in a traditional coil spring setup, and didn't want to switch.
I have all GW stuff, except they are getting out of traditional coil springs, with a limited stock remaining. They didn't have a rate I was looking for, and told me they no longer can get springs made. So went to a different vendor.
It's a little frustrating because all I can really do is take shot at guessing a spring rate, and go from that point. Currently, I have a 850 lbs spring on the front, and a 200 lbs on the rear, using QA1 double adjustable shocks.
It's very close, am on the wall if I should even try a different rate or wait until I have more drive time on the ones I have.
The shock I have is based on the pro shock body, without the threaded body. Compression and rebound settings are 1-14, and am currently at C10-R12 on the front, and C11-R14 on the rear. Considering I am set that high with the shocks, I may actually need a 900 lbs for the front 220 lbs rear, but again, before I change I want to get some drive time on it first.
My 2nd gen F, all GW, I have 700 lbs on the front, and the L5 CAT leafs on the back that are 200 lbs. I have Viking double adjustables for that, but car is still under construction. The leafs are not the full reverse eye, the main leaf meets the center of the spring eyes. It has the bearing in the front, Del-alum in the rear (need to double check, it might have the bearing in the rear).
Next week I go to have the A body corner scaled, and that should give me a better idea of how close I am.
You appear to be very close too, would be curious if you corner scaled your car and the weights you have. Both my cars have endura bumpers, and serpentine setups, so considerable weight in front of the front tires. A rough guess-timate for the A body is around 14-1600 lbs on each front.
Odd thing about the leaf cars, especially the 2nd gen Fs. May say they shouldn't use a rear sway bar, but have a hard time buying that. I've have a number of conversations with people competing with the F cars, and many don't use a rear bar, but just can't bring myself to not using one. Guess when the time comes, I will just have to try it.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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