My Dart Swinger Project!

Is your radiator support for a 22, or 26" radiator? Get a radiator for whichever one it is, but get one that has 2 wide rows of cooling fins. 2 wide rows of fins are better than 3 rows of smaller fins, if that makes sense.
A 22 came out of it. Well actually it's like a 18 the outside holes are like 24 1/2 iirc