[Bill]

Livng in Arizona, I have to have my Cobra pass emissions. This year they really tighten up the emissions standards, which I had passed the previous 6 years. I replaced the Barry Grant 750 carb with a new Holley 650 double pumper, hoping that it would run cleaner. I can't get the car to pass the loaded (35 MPH) test for Carbon Monoxide, but does pass it at idle. On the Hydrocarbons test it fails at idle but passes on the loaded test. I'm running a 351 Cleveland on a Weiand xcelorator maniford. I've bumped the timing up 26 degrees BTDC (suggested by tech support at Barry Grant). Replaced the plugs and plug wires. I'm sort of at a loss where to go next? Any suggestions?

Bill