Is there a possibility that your engine has a 49-early 51 Merc flywheel? If so, you need a 10" Borg and Beck clutch and pressure plate (which are hard to find these days.)
Any chance you could post photos of what you are dealing with?
Does your engine have a 49-51 Merc pressed steel bellhousing and matching starter plate?
Look here:
https://www.fordbarn.com/forum/showthread.php?t=212166