yep, a muncie can be broken quite handily... trust me! Verified or not, call me skeptical on this one. Why not just buy an m22 in a muncie case - they can be found at about any swap meet. Might be a little more than $750, but not always. You sound hesitant (or maybe that's just me feeling hesitant for you), so I'm not sure I'd personally dive in.
Depending on the automatics you've blown out - don't feel that buying an m22 is the end of your driveline breakage (sounds as though you might drive like, well, like I drove when I was your age). Once I got the M21 in my 57 chev beefed up, I blew out 3 rear ends in short order, one on the post install test drive (
), so start saving for that too as soon as you can.... Or "modify" the driving habits (I know, I know, my dad couldn't get me to modify mine either)