QUICK UPDATE:
Got the car sandblasted yesterday!!!!
The company I went with is local here in St. Louis and did an excellent job using fine crushed glass. Took about 4 hours and there is no noticeable warping to the panels (I did skip getting the hood sandblasted because it is such a large flat panel I think it would have been impossible to avoid warping it).
For those of you thinking of getting the car sandblasted and want to get the rear underside without a rotisserie the frame is so light that myself and 3 friends lifted the shell onto and off the trailer, and tilted the rear of the car up in the air and rested it on a frame made 2x6 wood.
I was hoping maybe some of you could suggest a relatively good primer to use to keep the car from rusting while I do the body work. Something that I can body fill over before using a a highbuild primer primer before paint?
Here are some quick photos, video update coming soon.