I was chatting with Shaun at AED about my planned cam, intake and tune upgrade and he suggested an electric water pump. He said it was worth 12HP. I did this mod way back in 1994 with my LT1 Camaro but sold the car before I was ever able to put it on the track. The buyer sent me video of the car running at Texas so I know it worked. I haven't heard anyone on this site mention doing this.