You cannot use either an early Windsor Flywheel or a Clevo flywheel.
The imbalance is wrong.
EFI windsor is 50oz from memory and the rest are 28oz.
You will need a EFI Windsor flywheel for it to work.

Off topic my brother has just put an EA T5 behind his 351 Windsor in his XD using the single rail bellhousing.
Couple of mods required but it all fits and works!

Sweet as, that information helps me big time. Will start pricing up a complete flywheel and clutch setup for the 8 and see what I come up with, or anybody on here have a rough idea price wise?? And Ive managed to pick up a manual EF xr8 ecu to add to the package which will be a little less f**kin around with the loom and what not. Im nearly there but its just the clutch / flywheel thats holding the show up. LOL. Cheers for the help Im gettting, makes the conversion seem not that hard to do.