Smaller water pump pulley

or get a good clutch and use the GM SS fan...

https://www.amazon.com/dp/B01M66A7WE/?tag=fabo03-20

thinkk this is th eclutch i'm using.. not sure if it will work with an aftermarket rad unless its close to stock position.. Hayden Fan Clutches 2947
Thank you! I'll check these out!