Hot 318
I can't remember exactly where...I might have mis-understood it as well since I was having some cooling issues and was cruising through that section for some ideas. I could have swore it said the AC pumps were'nt a good as the non-AC pumps. I'll look over the weekend and see if I can find it again
I just had my wife look at the book at home on page 246 on the right column Water pump section it states:
"If engine cooling is causing a problem the 1970-73 Non-A/C water pumps should be used."