You can use the Trickflow heads with out having to buy the $$$$ Harlandsharp rockers. With the latter year magnums . You just have to use a rocker that will allow push rod oiling. I am useing the PRW 1.6 Roller rockers. I think there is a member, with I think a white dart that is useing trickflow heads with comp 1.5 rockers and push rod oiling.