318 Flex-A-Lite or Clutch setup

I have a 73 Valiant 318 car which im planning on upgrading my current 26 in radiator to a Cold Case 2 row 26 in aluminum radiator. Now there radiator is 3 in thick and with the current clutch fan set up I currently have looks like it may not work. So im looking at Flex-A-Lite fans and wondered if anyone knows what size I can run with the factory shroud and what size spacer may be needed. It is originally an AC car and AC has been deleted and changed to non AC pullies.