Demon Problems - any suggestions?

[Jerebus67]

I am not too technical but wanted to see if anyone else has this problem and any suggestions? I have a ZZ4 crate motor and purchased the 650 Barry Grant carb for it. We have had nothing but problems setting the carb up. It idles well and runs ok but it seems like the low end power just isnt there. When putting the car in the garage after I drive it the garage just stinks of gas. I am thinking about pulling it off and putting an edelbrock on it? I would really like to obviously tune this carb so if anyone knows anyone in the Bloomington IL area that is good please let me know.
The garage stinks up the whole house, any idea why it is so rich?