'83 240D clutch doesn't work

[Archer]

My wifes '83 240D clutch won't release. I replaced the master and slave cylinders, bled them with a pressure bleeder, and feel that the clutch is depressing the way it previously has. Before this happened the clutch would have to be depressed all the way to the floor in order to shift the transmission.
My wife had cancer and recently died. The last time she drove it, it would not go into 3rd or 4th gear so she drove home in 2nd. The car sat for about a year after that.
When I recently tried to move it from the garage to the shop, the clutch would not release. Thinking the disc might be stuck, I tried jerking the car with the starter without success.
I haven't been able to find anything about clutches other than maintainence and inspection on the MB CD.

I've owned and worked on Mercedes for 30 years and can usually figure out what's wrong, but this one has me stumped. All help will be sincerely appreciated.
Gerry Archer
'83 240D & 300D