If it is 8 CFM it will be a 209, the 210s are 10 CFM.
Avery, are you sure it is not 10 CFM? Pretty much every one that I have found in the junk yards are 210s. If you've got an impact and a 5/8" bolt you can pop the clutch of in about 30 second to tell for sure. Look at the bottom of this page, it explains what to look for.
http://www.jedi.com/obiwan/jeep/york_id.html