Looking at the UMI arms, the main thing you’ll be giving up is the adjustable upper arm. The UMI arms still require shims for alignment. So you might not be able to get a 100% perfect alignment with the UMI arms, all depends on your setup. I have UMI rear arms on my car, they make good stuff.
Really what you have to do is come up with a total package.
I believe the AFX spindles require you to use C5-C6 Corvette brakes. Which means you need to run at least 17” wheels. But not all 17s work lol
Another factor is ride height. I haven’t looked at spindle options in a long time, but I thinkmost aftermarket spindles have a drop built in. So if you add up total drop, with lowering springs, tall lower ball joint, spindles, you may be slammed to the ground.
Also, make sure to ask around about lowering springs, I don’t think most companies post spring rates. I think a lot are pretty soft. SPCs may be the stiffest available regular springs
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67 LeMans, 326, M20, 3.31 12 Bolt
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