Do lower control arm reinforcement plates actually work?

As a Drag Racer type, I can't possibly fathom why anybody would do this sort of stuff to their cars...BUT!
I've got a pair of LCA's with the plates welded in already. New bushings, greasable pins, real nice condition.
Also have super thick strut rods and solid steering turnbuckles.
Take $300 for the package if anyone is interested.