A puddle that large from a leaking rear main does sound excessive. Are you certain that oil pan not leaking at retainer bolts!

Pull flywheel cover, start engine and watch pan gasket action with a good light.looking for seepage.

If leaking at flange/gasket, incorrect too long bolts at retainer will cause the leak.

Further information in Motor's Repair Manual, 1974 edition. Also a Chrysler posted a bulletin on this and the cause.

Rapid Robert is correct on finding prior threads.

Awaiting usual commentary from peanut gallery.

You are certain that not leaking from back of either valve cover gasket?