340 camshaft question, yea another one.

If you didn't have control over the idle mixture screws the tune up is off.

That camshaft is not the issue, It's only230ish at .050, not big by any means. it's the tune up around the engine. IMO, 16 initial is not enough for what you have. Should be 20-24. That will allow you to close up the primaries and likely get control over the idle mix screws. Crank as much initial in as the starter can handle and see where it lands.