Good job. You have to be a little patient here for awhile before you get an answer. We are currently building the site, and with guys like you, it will get built very quickly. Yeah, my 65 didn't have an overflow tank either, but that didn't stop me from going to Autozone and getting an aftermarket one for less than 20 bux. Along with my 4 row rad, 6 blade fan, shroud, 180 thermo, overflow tank and wetter water, my old dinosaur runs cool as a cucumber.