If it's running rich, you'll see lots of black smoke out the tailpipe, and that smell of gas you have will be unspent fuel also coming out your tail pipe.
Check thouse out, and if that's the case, then for sure you have a float issue, as well as other carb issues that will cause the car to pretty much run "flooded" all the time.
Rebuild kits arn't that hard to do.. prolly a cheaper route to go, at least you take the carb out of the OA scenario.
Other factors as mentioned above will also come into play, such as vacuume leaks, and even crappy plugs, Have a look at the EGR valve as well, Be sure it's working.
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