Heading down that slippery slope again, started with  dropping the gas tank for a "freshining" went to replacing the tank, looked at the frame and #4 mounts and figured "while I was down there" I would change the body mounts.  (see my other thread under "body") Now I see this frame has had major surgery so thinking at some point I need to replace it.  I did find a nice 78 frame locally for a good price but I understand from the book "how to restore your corvettes rolling chassis" that on the 78 frame the body mounts are lower (no big deal just use the thicker body mount bushings) but they also changed the mounting for the bumpers and the gas tank. Anyone familiar with info on how to make the mods to use on a 72 w/big block and manual trans?  I'm wondering if there is a simple way to modify by welding in new brackets etc. May be worth it if I can save $2-3000 on the frame!  Other alternative - anyone have a 68-72 frame for sale?  PS  Not sure this is in the right forum, let me know!

Imo, it ain't worth the trouble. As you mentioned, the frame ends are totally different due to the different bumper mounting, as well as the body mounts....along with a lot of smaller details that may or may not create a problem.
Then again...if you have a decent shop with a lot of equipment(welder, etc), lots of time and patience, and another frame that is really cheap, it might be worth a shot. I myself am just far too lazy to even contemplate something like that anymore.

If you are in need of a frame contact Steve he may have one.   Do not know about the cost of shipping something that big but it could be worth your while.  I know he has shipped a couple to the East Coast. 

There is a Vette supply shop near me that builds frames to GM specs for under $4000. If I ever need a frame I will use them. They even make them to fit C4 or C5 suspension if you want.