67 GTO Rear Suspension Q's

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I'm not disagreeing. I was just responding back to why they would be adjustable to begin with. These braces in particular aren't rocket science. All they do is connect a lower control arm mounting point to the crossmember/upper control arm mounting point. It's not like they change the geometry or anything. I'd guess you could make an argument that because they're adjustable, the design would allow them to flex just a little more, but even that sounds a little crazy to me.

Yep, if they are half the price might be a piece to consider.

FWIW the guy that ran the speed shop when I was in high school(early 70s) had a 64 Chevelle BBC Mod Prod car(big slicks legal) that "spun" the rear end housing mounts because the very early Chevelles did not have even the stamped steel ones like the stick GTOs got later on. So I think they are probably a worth wile addition for any kind of traction and alot of power.