Some friendly advise.
Take a very good look at your torsion box issues prior to digging in.
The reason for this is that "if" this is a blazer you want to continue driving for awhile, you may want to wait.
It's likely to be the 'tip of the ice-berg' kinda thing and your blazer could end up being under the knife for a long time.
Basically a fair warning.
Been there, done that and see it all the time throughout the board.