I'v got the body off my 74 stingray now as I had to replace the frame and am rebuilding as necessary while it's apart. I studied the roll bar problem quite a bit as I would like one too! Big problem = If you weld it in you can't take the body off without cutting the cage out. I suspect your car is primarily a street machine like mine, as racers cut the insides out and replace it with and aluminum interior kit. I'm thinking if I do it of: using a 4 point cage, having the rear tubes bent to point down 4" at back end of tube, weld 4 tubes aprox 3" high (that the cage tubes would fit snugly into) to my frame, cut floor pan to clear tubes, make grommets out of rubber tubing sliced open, seal it with silicone, install cage into tubes when installing body and weld up cage, then securing cage into tubes with 2 ea 1/2" grade 8 thru bolts. I'm thinking that it would handle a roll over ok and anyway Corvette owners usually get killed by fiberglass poisoning from the exploding body.