I just bought a 65 with the 292 6 cyl. It had all sorts of gas leak around carb. Based on the time I did not have and the cost (99 + core) of a rebuild 1 barrel, I opted to change the whole thing and glad I did. I put a new insulator on it hooked up choke cable and tightened it down. One air mix screw to adjust and the idle. Very simple took maybe 30 minutes. I have not put a tach on it yet but adjusted it by smoke and just what sounded right. Runs great made a huge differenc.