67 slant with 1920 holley dies when engine heats up and choke opens.

Slantsixdan,Thanks for responding.I took the old carb off,examined it,and where the fuel line flair inserts into the carb,I found two small pieces of rubber,I believe,no doubt starving the carb.I did this,though,after I put a refurbished carb back on the car.It runs allright,heh,better than the horror stories I have been hearing about refurbished carbs.But I am thinking of putting the old carb back on,though,Monday,Labor Day.Where the fuel enters the carb,there appears to be a black rubber membrane behind the small (about 1/8 inch) round opening to the carb.The small area I see seems fine.Could any of the small pieces of rubber I found have worked there way in a reverse direction,meaning there is damage to something in the carb? Or more likely to me,the rubber pieces came from the 2 fuel filter hose edges,maybe,and got hung up right before entering the carb fuel inlet. Rich