Just off of what you posted, two areas I would look into first. The ignition system, particularly the mechanical advance. And your valve springs and retainer/valve guide clearances. Save possible carb problems after these checks and/or settings.
Food for thought.



"Stupidity is Ignorance on Steroids"
"Yeah, it's hopped to over 160" (quote by Kowalski in the movie Vanishing Point 1970 - Cupid Productions)