When you need parts for your truck, '64 to '66 parts will interchange. I put a 66 radiator in my 64 because that's all that was listed. The 60 to 62 trucks had different suspension set-ups, different drivetrains and the 60 to 63 trucks had different cabs than the 64 and later trucks.
Welcome to the Stovebolt and have fun with your truck,
Scott
