Radiator dimensions

Just measured mine as I'm lookin for a replacement radiator. The original is 22 1/2" tall to the top of the filler cap. The only aluminum radiators that I can locate are 1 1/4" taller or 23 3/4" tall including the filler neck. Mine is a '66 original 273 Cuda. Know the post is old now but trying to help. Does anyone know how much clearance is available below the hood on the 66 Cuda using a stock radiator? Thanks!