66 Dart 360 Swap Questions

What radiator is in it now? If it's a 22" 2 row, it can be made to work if you make custom hoses, or, have different necks soldered on the the tanks. I would prefer to go to a 3 or 4 row core, but, I don't think a 4 row will fit a stock tank that year without some sort of modification. If you're not concerned with keeping it stock looking, an aftermarket aluminum one would be the way to go. If you have a 19" radiator now, forget that and get a bigger one.