I've done some more work and more searching... looking for noise and resistance to turning. And some progress made.
I jacked up the front end and removed the wheels and disconnected the outer tie rod ends. Turning the steering wheel now offered no resistance ... nothing wrong with rack obviously. I was surprised to find I could easily turn the RH steering hub by hand whether a jack compressed the strut or not ... so nothing wrong with upper bearing mount (this was really a surprise ... I had already bought a replacement bearing. Oh, well!). The LH was similar except for the brake backing was bent in such a fashion that if rubbed against lower control arm. This problem corrected by removing damaged potion of backing plate.
While accessible, I replaced the rear engine mount ... sure enough, the old one was broken. Good move!
The Winnie now drives a bit better, but the noise during turning is now more predictable. I checked the sub frame support bolts per Scubacat's suggestion. Bolts are OK, but I realize these isolators probably have over 300K miles on them .... so I've ordered new ones (F68Z5C148AA and AB)...$250 with taxes and shipping. Arrives next week. Stay tuned!