340 demon overheating problem

i HAVE A 340 DEMON WITH A BUILT 340/450 HP 12.5 TO 1 COMPRESSION. aM RUNNING STOCK RADIATOR W ELECTRIC FAN, hAVE IN ITV NOW A165 DEGREE THERMOSTAT. tHEC CAR WILL RUN 220 DEGREES ON A 60 DEGREE DAY. THINKING ABOUT ADDING A FLEXOLITE OR CLUTH FAN TO ASSIST IN COOLING THE CAR. THE ELECTRIC FAN IS APPROX. 18 INCHES ACROSS. IT PUSHES AIR THROUGH THE RADIATOR . ANY SUGGESTIONS?