Lets see, easiest stuff could be do you have the
proper gas cap, vented I believe on yours, volume of gas sufficient? fuel line off at carb, connect
to hose watch flow while tuning over, dist. wire dissconnected, does flow change?watch for alittle while.Could fuel line be touching block (from pump to carb. Vapor locking)this happenes after warm -up.I'm guessing wrong cap and vapor locking.Keep up posts and let's what shows up as the coulprit.