Pusher Fan Advice?

I'm looking for input on a pusher fan, I have a 69 Dart 383 GTS, aluminum heads, intake & new aluminum radiator, everything is new, has a 165 degree thermostat
Tell us more about your current fan, shroud?, Pulley diameters, type of water pump (number of vains etc.)

I know 2 guys with 383 darts both have stock cooling systems and no overheating issues