Took your advice and yanked the transmission, bell housing, and flywheel. We (four mechanics) saw no evidence of the cam plug or threaded/sealed gallery plugs leaking at the back of the block. We did notice oil coming down from the road draft tube fixture at the back of the intake manifold - fixed. Saw oil running down the rear corners of the block that ends up on the starter and looks like it runs down the block to the block plate on the other side. Did not see evidence of cap side seals leaking and front side of crankshaft & flywheel don't have oil slinging off them. Bolted it back together, changed the valve cover gaskets, and ran it - still leaks.
Suspended engine, dropped K-member, dropped oil pan and windage tray. Still no oil visible on front side of crankshaft flywheel mounting flange. See picture 6546 - oil running down front of block plate. Changed oil seal with another Fel-Pro unit - this time putting light coat of Good Stuff on outside of seal and filling side seal grooves, along with 3/8" offset and small dabs at end of seals. Installed cap, torqued, and pushed RTV-coated side seals as far as they would go pushing sealant out. Cut off end of rubber side seals, pushed more sealant into cap/block intersection, put a dab of sealant at the cap/block point, installed gasket-windage tray-gasket-oil pan, and torqued. Let sit overnight, retorqued pan, put it all together with a new left valve cover gasket (just because the old one was suspect) and ran it this afternoon. Still leaks down the front of the block plate and at both the lower rear head stud/nuts - see 6552 & 6556. No valve cover leaks and can't see any intake manifold leaks.
This is driving me crazy! Was s'posed to have the car at Road America for the Optima event this month, but unless somebody's got a grand revelation, I'm going to give up my spot.