Advance the timing a little by rotating the distributor counterclockwise a few degrees.The fact that it runs with the throttle open some indicates it needs a few more degrees of advance provided by the centrifugal advance while the engine is running. If it bogs the starter down or backfires through the carb, you moved it too far.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!