Rear shackle modification

I replaced my rear shackles with spring sliders, which are quite a bit shorter, and that only lowered the car about a 1/2”.
I wouldn't exactly say they're noisy.
I have been on the A-Bodies forum recently, mainly checking on progress on moselyme and his F&B modded Weiand 6bbl intake and to get information on the intake, since I just got one.
I have just ordered Calvert split mono leaf springs and Assassin traction bars, and I got the Calvert sliders to attach the rear spring mount, so I'm glad to hear...that you don't really hear them. :)
I wanted the sliders as soon as I saw a video of them in operation.
I did select the +1" ride height springs, thinking that would offset the 1/2" drop of the sliders, and to keep the narrowest part of the inverted U of the rear fenderwells away from the top of the rear tire, so I can get the widest tire possible with the stock leaf spring location.
So far, on my 70 Roadrunner, I have been able to get a 315/35/17 to fit with zero rubbing, perfectly centered, with a 5" backspacing, but I want to try a taller sidewall for a better launch, without a narrower tread, like a 345/45/17.
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