I smell gas from my 6 banger

I have a 225 slant six on my 67 Barracuda and smell gas under the hood (much more than normal). I smelled it both before and after I rebuilt the 1 bbl holley carb and I don't see any obvious signs of gas anywhere. Any ideas where to look? I'm also getting really crappy mileage but it runs fairly well. It's got a Chrysler orange box for ignition. Any ideas?