That was me that brought up the 200R4. From what read/been told by my tranny guy all it needs is a 12 volt source to work. They are easily found in mid 80s g bodies.
I'll have to talk to my buddy on Monday. Is it a bolt on replacement then? New bell housing adapter and in it goes? Splines match and all? I imagine I'll have to cut my brand spankin' new driveshaft again.