I forgot to mention that the original fan is in a box on the floorboard. Put that together with the fancy aluminum radiator someone put on, and I'm guessing it's the original engine and was overheating on them. I'm going to flush the system and possibly change the water pump if it still wants to run warm.
From what I could find, in 1964 you could get a 223 I6 or 292 V8 from the factory.
I had a converter stop up on me once years ago. I made sure it would never happen again.
