Spent the last couple days replacing the whole fuel system in my car as rust was coming through the per-carb filter. Changed the original 65 fuel lines to the 69-70 lines, not only are they 3/8, but the routing they take is away from the driveline/exhaust, and they were an easy install, only had to remove the rear wheel and drill a couple holes. Also changed the fuel tank, sender and put a Carter fuel pump up near the tank. Ran a ground cable from the front to the back with the power cable, and she hums :) The old fuel pump didn't like being grounded to the chassis near the tank, a ground line seemed to fix that.
While i was at it changed the carb to a Summit 600 carb, either my old carb was terrible or the new one is a godsend, but either way it feels like i bought a new car. Response is awesome, make it a lot of fun.