Thanks everyone!
Diagonal brace is the key. Remove, slide up from underneath over the drive shaft (the luggage box is out...since I'm working on cleaning the accumulated spooge off the inside and painting when I finish with the oil pan) forward far enough for the tailpipe to clear the rear cross member...twist and turn into position, fasten to tranny. Took all of about a half hour, and in the interim once I had the muffler hung, took the diagonal brace to the big tub in the back full of cleaner (environmentally ok...the stuff Harbor Freight sells...smells like Fantastic cleaner), scrubbed it down with a stiff brush to get the crud off...rinsed, dried, a quick spit coat of zinc chromate primer (wore my organic vapor mask...
, flashed off, then a couple coats of gloss black.
While that was drying...took my dremel with a stainless polishing wheel, cleaned up the upper bolt hole on the frame for the diagonal so the 2 grounds that are attached there had a clean surface, and burnished the ground wire ring terminals. A little penetrox on them...
Just a suggestion when you're putting bolts back in...normal practice is either down, in, or back. The two bolts for the frame were in opposite directions...one inserted from the back, the other from the front...they're all facing the right way now (with new AN360 washers under fresh nylocs) and a star washer under the ring terminals to give some 'bite' to the ground lugs.
Just an update...needed a 'success' before tackling the oil pan. I've probably got a good saturday's worth of work ahead of me to get it all done.
(yes, that's a threaded insert on the top of the cross brace so I can bolt down the luggage box...same on the other side.)