I think the front bearing retainer is a larger diameter on the Muncie, the GS throwout bearing won't fit.
Bearing retainer can be turned down on a lathe. Had to do this to my Richmond as well. Retainer also didn't fit the bellhousing, needed a second trip to the machine shop to turn down the flange OD as well. I haven't heard of the flange being larger on the Muncie, but you better check.
A moderator may want to divide and retitle this thread since we've all gotten so far off track from Lorens trans for sale!