65 dodge dart 270

The K-frame isn't very heavy, so doubt you would save much weight w/ a tube type. Tubular upper control arms have adjustable mounts so you can set caster better for radial tires. With the factory UCA, you must use Moog offset bushings to get caster right. Forget the PST poly LCA bushings. They seemed hokey since the LCA could then slide backwards, and I recall PST even stopped selling them. Some people cut off the factory frame rails and weld on a coil-over suspension kit, I think some w/ rack & pinion steering, but >$3000 and irreversible. I recall some that bolt on instead, but I don't venture in those play-pens.