I had a cam that was 218/230 duration. At an idle my manifold vac. was down to ~10 Hg. My pressure regulator was referencing this lower vac. and was letting more fuel through. At an idle, it was not possible to trim the fuel back any more, so I was running very rich. I bought an adjustable regulator, and set it lower so that the 10" vac. would put me back where I wanted to be. Not so rich.
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