You'd think they would have either used different water pumps or different pulleys but not both.
I've never had non a.c. M but do have non a.c. In my Lil red express.
I also have 82,84,85 m's to compare parts on as well as a 79 a.c. 360 in my 88 and the parts from the 88 318. This is almost getting me curious to check.