I did it to my 67. to big "L" brackets bolted to the bottom of the car. Frame was off, just the body. I built two "7" shaped brackets (not "L's")so that the car would go up straight and then lean over a little farther so it would sit there.
I put castors on the final resting legs so I could roll it around. Used the front frame mounts by the firewall and the rear frame mounts in front of the rear wheels. Took 5 guys to flip it on it's side. I used 2" x 2" x 1/4" tubing and someone who knows how to weld better then me.On the body mounts I had to make 4" extensions to reach to the body mounts with tabs on them to run a bolt through and into the body. These are required because the rocker panels hand down lower then your mounting points.
I have regular pictures of this but nothing scaned or I'd show ya. E-me if you can open up autocad drawings and I'll send ya a sketch.
Roger