'twas a nice day today, so I decided to get busy putting in the motor mount shims. The driver's side header was just about touching the torsion bar. Loosened the bolts, picked up the engine with the crane, and put in a 1/8" shim. Tightened everything back up, dry fitted the header. Still not enough clearance, so did the whole thing again and put in a 3/16" shim. This time, I got about 3/16" clearance. Hope that's enough. The oil pan was now right up against the passenger side of the K-member, so I ground about 1/8" off of that to give some room there.
The manufacturers of these parts all assured me they were "bolt-on". So far, none of them have bolted on without some sort of modification.
My next job is to install the clutch linkage. Parts of it were lost, so I have to find some replacements. Argh. Never trust anyone else to do a teardown.