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Installed one in the Road Runner almost exactly like the one Jerry posted looks OE but its aluminum. Wanted to keep it stock looking and not have a big old bright aluminum radiator installed. Also the shroud fit nicely to it. So its plug and play.
A weak cap can let coolant or air past it. Perhaps its not boiling and just bubbling. Take a temp of the coolant in the recovery tank when it appears to be boiling. You say the car is not overheating.
Most 440 trucks after 1970 had upper driver side inlets. So here is a list to check out.
https://www.partsgeek.com/catalog/1975/dodge/d100/cooling_system/radiator_hose.html
Gates Radiator Hose - Upper
Part Number: 1754-09059833
Brand: Gates
Notes: Molded Coolant Hose -- With Standard Cooling...
Newer radiators with plastic tanks SUCK and I wouldnt put one in an old car. The one I posted below is the one I purchased for my run stand 145.00 Thats cheap for a decent radiator.
https://www.ebay.com/itm/123713835243?fits=Year%3A1969%7CMake%3APlymouth&hash=item1ccdeb50eb:g:YwQAAOSwYENcndjq
That looks pretty cool I would buy it. I bought an ebay radiator was pleased with it. But it was not an oem type. It was a 26 but was more squared off.