You have a lot going on there.
-The sheet metal is early MD Juan reproduction.
-Dana 44 rear axle and Dana 25 front axle suggests a later CJ3A or M38.
-You already knew the engine is a transplant.
-The seat frames are not original, but look like a pretty nice modification.
-Radiator is a 2A...early 3A or M38. A slightly different view would help narrow it down.
-The body tag doesn't look right. I'm not sure what's going on there.
-The front wheel looks like an original Kelsey Hays 15" wheel. Not sure where the rear wheel belongs.
-The frame is a 3A.
It's a real nice rig overall. Because of the frame and the axles, I would probably say it is a CJ3A.