Oh damn I didnt know the manual choke 600's were set up more for performance or I would have gone with that setup. I might have to get that calibration kit and see what that does. Edelbrock, Holley or Demon guys...I've messed with Holleys and Edelbrocks but not with Demons and for me I think Holleys are harder to tune but then Ive got buddies who swear by Holley and say Edelbrocks are junk so i dont know, maybe get a 800 Demon and say the hell with it! LOL Thanks again! And if thats your car then Awesome ride man!! I love the Satellites and RoadRunners, favorite body styles. Along with the 68 and 69 Barracudas.