Good Morning All
Have done some more research on the radiator/fan clutch issue.
It would make sense that overheating in slow/stopped traffic MAY be caused by a lack of adequate air flow. All seals are are in place so that leaves the fan. As stated, water pump was replaced (440 source).
The car did not originally come equipped with a fan clutch so my research as research shows that the Hayden 2747 is listed as a replacement. That now leads to a replacement fan as solid fan drive is different. I have a couple of clutch fans in the 'stash' A Mopar 2863215 and a GM from a '66 GTO. Both fans are the same diameter (either 17.5 or 18, hard to measure), number of blades (7) and mounting dimensions. The only visible difference is the blade pitch (photos below). Both will mount up with about .75 inch clearance from the radiator. Apparently Mopar Performance recommends .5 inch but it should still work,
The GM fan appears to be more aggressive that the Mopar. Other than possible noise, (and the fact that it is GM) would there be other down down sides?
Thanks to all who respond.
Mopar FanView attachment 625858
GM FanView attachment 625859
I don't think the GM will be a roaring problem with a thermal fan clutch unless it's doing towing duty up long grades in second gear in hot weather that would engage it.
Then it's going to suck up lots of noticeable power to run it up that hill at 3k rpm if it does engage. Bunches and bunches.