All of the following cars will at least have reinforced frames and upgraded suspensions.
1) A-Body El Camino
With air helper springs and regular shocks. So ride will be better and can still do truck stuff.
Either 250 or 292 I6 or BB V8. Because in the words of Mr. Miyagi. “You walk on right side of road or left, walk in center and squish!” or something like that.
Not sure if I’d want it to be manual or automatic.
2) 2nd gen F-body
With LL8 (Because redneck BMW) and manual trans of course. Weekend/Track car, so heavily upgraded suspension and such.
3) Chevy Vega (or Chevette)
With F20C because I can! (probably can’t though)