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The bigger concern I have is even if I run Speedtech upper and lower a-arms + dropped AFX spindles, I will get have some steep a-arm angles & possible ball joint bind if I can not raise the upper & lower a-arm mounting points to try to make the a-arm parallel to the ground.
This pic shows the cross member touching the ground w/ airbags deflated on another car and steep a-arm angles.

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that looks as low as possible??????
This car has exactly what you are asking about, with QA1 GMP kit. and 550 lb springs. as well as the complete rear kit.
here it has 18 and 20's