Go with a good ol fashioned Holley. I have never owned a Demon but had a good friend that had a 750 Speed Demon that wouldn't work for him. I couldn't tell you if it was a bad carb or not...cuz some people just don't know how to tune carbs. He did end up sending it back and getting a Holley though and his problems were fixed. I know I've had good luck with Holley's also.