360LA Clutch Fan

I’m running the newer water pump with the passenger inlet. I had the original radiator re-cored to handle the extra horsepower. The old 66 273 had the fan blade attached to the water pump pulley with 2” spacer. The bolt pattern of the clutch is off about 3/8” from the water pump pulley. The water pump from both engines have the same bolt hole patterns. Am I stuck using a non-clutch fan—flex fan? I’m not racing this car.. just a weekend driver..

Appreciate the help..