Well, I went to my local parts jobber, looked in the "big book o' radiators", and wound up ordering a # 433-517 ( the last three digits are the important ones), which is listed for '73-'75 Duster /Dart.
The core is almost identical in size to my OEM radiator. The mounting flanges are a bit wider, paricularly on the passenger side, but the new rad drops right into place, no problems. I was able to use the upper driver's side mounting hole as is, the remaining three I marked using an awl through the captive nuts in the core support, and drilled new holes in the radiator flange.
The new rad also has a tranny cooler (not needed on my car), and there are threaded bungs in the upper tank for sensors, if anybody is running electric fans...
The upper outlet doesn't quite line-up with the water outlet from the engine, and the lower outlet comes straight-out, instead of being a 45 deg up and to the outside like the stock. So, a trip to "Home Desperate" and some 1-1/4" copper 45's and 90 deg street elbows rectified that issue.
The end result was a new radiator with a "lifetime" warranty for $140 plus shipping.
The car runs much cooler on the highway, although I still a slight increase in temp on the dash gauge when I turn on the headlights...
I'll squirrel the stock rad in the loft of the garage until I have the spare $ to have it re-cored.
Thanks for the tips !
De Soto Frank
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