Success...trans dropped and clutch/flywheel removed:
I didn't know the OEM clutch was a twin disc...should of expected it, but now I know why it works so well even with 655 HP!
And the flywheel:
The rear main seal is hardly oily...almost like it had a couple of 'events' and returned to normal. Nonetheless, will research if I can just pry out the seal and tap in a new one vice my original plan of replacing the entire RMS plate/seal. This requires disturbing the seal to the oil pan at the bottom (just RTV)...more work and more risk to more leaks IMO.