1965 4-barrel intake

You can only use a 65 intake on the 64 273 .The 64 & 5 have a different bolt hole angle than the 66 and up heads and there was no 4bbl version of the 273 in 1964 but the heads are the same from a 64 and 65 but with the 4bbl you need heavier springs if you are going with a cam similar to the commando 273 4 bbl motor .