An update- found a local shop that rebuilds brake and clutches, and had them rebuild my MC. Long story short though they couldn't rebuild it because:
A) they couldn't find a rebuild kit for it, but it didn't matter as:
B) when they opened it up they found the bore had rusted. So even with a rebuild kit it probably would've required so much honing to clean out the pitting that the kit would've been useless.

So they wound up locating a rebuilt MC as a replacement, which ran me about as much as the rebuild was going to.

So right now the MC is back on the car, I've hooked up the bleeding kit (keeping in mind the aforementioned problem with the brake line threads rear cylinder don't quite work with what the bleeding kit has), and while the front seems to be bled ok, I still hear/see air in the back reservoir.

My next step now is to go to NAPA and see if I can't cobble together a better MC bleeder setup with correct threads as I'm positive the air's getting pulled in from the badly-fitting plastic nut I'm using in the bleeder kit...

David