1959 cd16 5.5 h.p. she will idle all day long and purrs like a kitten at slow speed,but when you open her up, she just bogs and has no power. I installed new coils,points,condenser,plug wires,and cleaned the carb. Points are set at .20 and the plugs are gapped to .30 have 24:1 fuel mix. What could be the problem??