Ok. What about the rest of the tune up? Timing? Vacuum signal? Also, remove the air cleaner. Grab the carburetor from the sides with both hands and twist it. Kinda like you're trying to unscrew it, but back and forth. If you can wiggle it, then you need to tighten up the screws that hold the top plate on and the two mounting nuts. Over the years, the gaskets shrink and the fasteners will loosen up and cause vacuum leaks. Sometimes all you need to do is tighten everything up, rather than doing brain surgery to rebuild the carburetor. On the timing, I would pull in about 10 degrees initial and drive it. It might like 12.