Some of my spark plugs are burning rich and some are perfect. The 2nd and 4th in on driver side and the 5th and 8th in on the passenger side are the ones burning very rich. I changed the wires to see if I had bad wires and the same issue. I have a 1406 elderblock carburetor. I read Jason's post on the carburator and  pulled the carb and noticed the holes in the "gutter" were not plugged. I there were no other holes on the top of the manifold. Any one have any idea's and should the gutter…

I just rebuilt my 1964 429 engine and I have a Elderbrock 1406 carburetor on it. I reviewed the blogs and I have an issue with it burning rich at idle. I talk with Elderbrock and they said advance the timing to 10 degree. My mechanic was hesitant but we did it. I still have a rich fuel burning also with black carbon out the exhaust. We are getting a little condensate out the back also. Any help or idea?

Thanks

Dominic