I've been looking but I can't find this information anywhere?! I need to figure out what clutch and flywheel I will need for this engine swap. I have a 1990 ho 5.0 out of a mustang that needs to bolt up to my m5od. Any help? Number of teeth? Anything would help

 

Advance Adapters is an awesome resource site that has all kinds of info when doing swaps. They will even list items by their part number to make the swap work better. I have done a few odd swaps (5.0 and 5.8 into a 4x4 Ranger) and they had all the info I could stand. I just spent the time reading the links they had and ordered their parts. both installs were a snap.
You also type that into a search engine or check out Jeffs Bronco graveyard to start following links. My manuals are at the house and I am in Afghanistan otherwise I would give you the complete list. But this is how I started on the swaps.