That is more spring than I would want for something I was going to drive a lot. It is also more spring than I would want with 275s in the front. The 69 we have with 315/335 is running 650/400 and the tiny 3/4" rear sway bar and it works well. JJ also did the shocks on that car.
Also worth noting, DSE has updated the upper control arms since your subframe was built. There is more caster built into them now.
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Donny
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