One of the mopar mags had some information on the Lakewood bell housings sold through Holley. Go to the Holley wesite and search for Lakewood bell housing for the current information .
Lakewood is making bell housings "new" for gen 3 Hemis as well as small blocks that accommodate a883, tremec trans. Sold through Holley. Good luck, hope this helps.
I had a similar occurrence on my 69 340 four speed. In my case the clutch fork pivot had failed. It is held on by two bolts and is easy to replace AFTER you pull the trans. Good luck and let me know you find when you teat it apart.