1975 frame off with a restored original engine, supposedly. It came up from Ecuador few years ago. Vin on the plate matches the frame but yes the vin tag is not original.
Thought she was a 1975, but now discovered (Thanks Matt!) that it has the .5F (or 1.5F) 1974 engine. ummmmm??? The vin number also points to a 1974. The wiper motor is up top, which I think points to 1974. But the ambulance doors I thought were introduced in 1975... More pics on the way...