OK..69 Dart with 6-71 roots blown small block..I am thinking about using a HHR fan assembly to keep things cool..Will it fit??? It has the stock mech. water pump on it. This is a street driven car with 3.90 gears,727 w/ 3200 stall,5 psi boost,dual 600 Eddys....Where would you set timing to begin with???? No dyno near me so its going to be trial and error. Oh ,I live at 7000ft. elev. Most of my driving will be at 7-6000ft. AS to the cooling...the radiator is a summitt aluminum unit. Thanks