Options to stiffen chassis 69 Firebird?

[Build-It-Break-it]

Originally Posted by simon455

Full frame is still a better option on a STREETCAR, chassis already becomes pretty rigid ( I think he's more after that) and can benfit from using conventional body mounts which somewhat do help a lot with NVH.

"My question is, what are some of my options to help stiffen the chassis?
Because I finally decided Air Ride was a must and not knowing of any aftermarket options that was designed to use Shockwaves at the time, I decided to use my stock subframe and already had it modified, sandblasted & powdercoated"

I think he already modified his front factory subframe and is trying to find ways to stiffen everything from there.