When I tried Autozone soon after buying my 65 Dart 273, I found I could only get a later radiator ('71+?), with lower hose on the passenger's side, and it cost $200 for copper.
I don't recommend because this mandated a change to the aluminum water pump, and still collecting a power steering pump, brackets and pulleys to make that work.
Since then I see 22" Dart aluminum radiators on ebay w/ driver's lower tube. Cost is ~$130 for 2 core or $200 for 3 core. It looks like they would bolt up. I also got a used 22" copper radiator (from B body?), w/ pass. lower hose. It doesn't quite fit because the mounting holes (as 65Vart) and seems a bit too tall, though perhaps my bottom frame is pushed up a little in the middle.