[Talkwrench]

Carbs should be .043 mains and 69 pvs sea level up to 5000ft.
If the cam is stock you should be able to get it closer to 600 rpm.
Just vacuum time it to best and back off 1" Hg and try it .
listen for detonation and look at your plugs periodically make sure you dont have and silver or black spots on the porcelain.