smoking 360

If the valve seals were replaced, it sounds like the rings haven't seated. It should have at least been honed to take any polish out of the cylinders and allow the new rings to bite. I bought a 67 Honda 350 Dream that the engine was just rebuilt and it was smoking from start up and was run about an hour or two and was still smoking so the guy sold it (cheap) cause he was frustrated. I rode the bike 18 miles home and I ran it pretty hard, by the time I got home the rings had seated and no more smoke. Might be what you have.