The 2 barrel carb looks about the same thru the late 70's. I think they just added a few vapor lines to suck up emissions and such, or maybe leaner jetting. My 65 273 had a PCV hose. A CA car, but I think all U.S. used PCV then. I got a new carb on ebay for $25 a few years ago. Haven't driven the car, but started it up and ran without a radiator for 20 sec to test. Ran good even cold. I have it now on a 4-barrel intake w/ adapter since I will switch to TBI eventually.
goldfish65 is correct, but I think his is called the Economaster. Holley made those for most applications in the late 70's. They perform well, but I read that some internals can clog over time and can't be rebuilt. You can find new ones on ebay. I got a used 4-barrel one cheap that I will try.