Been hearing a vacuum leak on my ‘67 and went to take a look, but can’t find vacuum lines. Engine was swapped from the original 289 inline 6 to a 351C. Have tried to look up diagrams of the engine but cannot find anything matching. Any help would be greatly appreciated.
Get some carb cleaner and with the engine running spray it around the base of the carb. You would likely not hear anything if it was just a vacuum hose that was disconnected.