Small update. Oil lines redone (maybe for the last time?) and so I put oil back in the engine and bolted the exhaust back on. Weirdly, it's tighter to the frame than it was before, so I'll loosen all the nuts tomorrow and see if I can adjust it.
Still gotta test the clutch but now I can maybe start the engine to do that.
IF I can get clutch (wish me luck!) I'll be able to go ahead and tighten up everything— shifter cables, re-align the wheels, big axle nuts, etc. etc.—and then put the rear shocks, engine cover and various dust-excluding accoutrements back on the car. Then hang the driver's door, put the floor in and be at last ready for her close-up with the Maryland State Police and MVA.
Gratuitous shot of 550-0054's open engine bay follows: