I have a 65 Sportwagon with the 300 engine, 4 bbl intake, and crossflow radiator. For a molded upper hose, the standard listing of gates 20543 or ac delco 26003 did not fit my car. If you know what I'm talking about and want the correct molded hose you will need GM 1372789. I couldn't find a cross reference for it and I believe the only way to get one is to find one NOS on ebay. Let me add that my car doesn't have a/c.
Got a pic of engine compartment? Sure it’s a cross flow and not a down flow? My 65 special in down flow.
