727 build fail

I finally got a chance to pull this trans and its not looking good. Came apart good until I got to the rear drum and the output shaft was stuck hard in the rear support. I got the shaft out by hitting it with a brass punch, shaft looks ok and no scoring.
Now I cant get the rear drum out. It appears the over running clutch is the culprit. Its come apart and locked everything up. Any suggestions on how to get out the rear support and drum? Im really hoping to save this case since its numbers matching 340 car.