John,
If/when you pull the trans,flywheel etc spray some of the white crack test developer on the suspect area (clean & dry first) then run up
oil pressure with drill & check for leaks. If there is still no indication refit flywheel and an old auto trans or Ford OE bellhousing with starter and actually run motor for 15 minutes approx[ Set bellhousing on block of wood and make sure earth strap from frame to engine block is connected]. Then these parts can be quickly removed to check source of leak after shutdown. The developer will wipe off with wet/damp cloth.
Jac Mac