Doug 371 is correct . The 1969 small block radiator bottom hose is on the driver's side, while 70 on up is on the passenger side. And the timing tab on the timing cover also switched sides, as did the timing mark on the harmonic balancer. I called Glen-Ray yesterday. The cost for installing a new core (3 row) on my radiator was $750 plus shipping in both directions.
To 72Dart6pack- I wish my pole barn looked like your garage, which looks like a museum.