I am using the viscous drive and 7 bladed fan off of a 69 Olds 442. Much, much quieter. If you can get just the 7 bladed fan, it bolts up to the Stude viscous drive. The Olds clutch has a thicker shoulder that bolts against the water pump pully. That 6 bladed fan will keep you from hitting any deer, it will scare them and any evil spirits away.