A-Body chassis bracing- stock and aftermarket- what's good?

Thanks, guys.
The shock tower brace does sound like a good idea. I'll look into that. My Mustang has one...I had also added one to my old Miata (which made a noticable difference, actually).

Has anyone added subframe connectors like these? Are they worthwhile?
http://www.xvmotorsports.com/products/detail/index.cfm?nPID=16&cid=105&cdesc=Chassis%20Stiffening