Good advice, @retroron. I've decided on the StreetLynx, Ford 9" and mini tubs for the rear. I believe this setup will work with exhaust and stock tank, but I will find out.
If your steel is good and solid but just has some pitting, clean it with a blaster or wire wheel then use some All Metal putty to smooth it back out. I did this in the trunk pan of my Roadrunner and it looks like brand new.