I have done many thinngs to the holleys. like some guys do to them. i have spent much time on them but what really pi$$t me off is when the teck/ floor sweeper told me hammer dents on the main body of my new 4500 holley was ok .NO it was not . lucky i have a mill .after i mill it it did work better for all the trouble. they sent me a set of main gaskets & bowl gaskets. i have a demon i just removed from a customers car i do not know what he or the last guy did to it to be fair but it ran bad and he had it . so i put a afb edelbrock on it and runs much better.i can not tell a customer to use somthing thats to much $$ and dose not work good . i have not heard a lot of good thinngs about the demon. the name is good DEMON .they give you nigth mares. you mite need to get you car a exorcism