PST lca stiffening plate on LCA with factory sway bar bracket

Notching it would probably give you a cleaner looking result. As long as you clamp it down tight it’s unlikely it’ll make much of a difference either way since the overlap is fairly small. It won’t make a difference in the overall strength of the LCA.

Overlapping it might strengthen the sway bar mount a little, but it only overlaps the one corner so it wouldn’t do much for the mount, assuming that’s all you did.