Have the Langdon "Bulldog" cam in my .040 over 261 with Fenton headers and dual Carter/Weber carbs. Has great low-end through mid-range power. My truck is a 55 1st with the original 4-speed hydramatic and a 3.90 gear and a 28.5" tall rear tire. Pulls great at 50 to 65 mph. I don't have a tach but my truck really likes to cruise at 55 to 60.
