Thanks guys! I've gotten a number of replies from the LCML that say yes, no problem using 3 speed flywheel and clutch in a 4 speed housing, so that's the way I'll go. Ben, I could sure use that shifter, retainer and spring. Let me know how much you want for it.
Also, I have what appear to be a zillion 3 speed clutch inspection covers but haven't come across a 4 speed cover. Anyone have one? And last, "while I'm in there" (refreshing an engine for this project), I'd like to put on 2 row crank and fan pulleys for future P/S...anybody have any lying around?