I can't say much about the Demon as I have never had one, but I have had plenty of Holleys. I like the tuneability and simplicity of the Holley. The Demon is supposedly a modified Holley design so if they improved upon the Holley design it should be O.K.. I would like to hear what a Demon owner/tuner has to say though.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons 
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542
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