I need to order my Carb for my 68 coronet 440..
I am going with the 850 CFM but was wondering is the Speed Demon better or the same as the Holley?

They are from the same mold so to speak. The speed demon probably has more adjustment

Yea that was I was told but was not sure if one was better than the other or one would give me more performance..I would like to buy a used one if I can find one to see how I like it..The Speed Demon that is.

Call Jessie at bigs carbs....
http://www.bigsperformance.com/