When swapping the 216 for a 235 engine (55 model). I installed the short waterpump and the result is that the coolingfan sits aprox.5 cm lower then in the 216 CI. wich is closer to the thermostatehouse. A simple way to get better engine(235 CI) cooling is to lower the radiator a bit aprox.5 cm in its frame,you have to drill 6 new holes but this is a peace of cake. Using a160 F.thermostate instead off the regular 180 F gives a better cooling. It opens earlyer wich is good fore your engine.. Some kichen bench sience; A 160 F.thermostate opens at ca. 72 celcius and the 180F. opens at ca.90 celsius Matinius.
Well , NO ~ Your engine runs better & lasts longer with a 92° C (185° F) thermostat . Running the engine as close to boiling as possible makes the most power and best fuel milage too . Most folks just use a brand "F" 390 V-8 fan and WP pulley for clearance .
