318 Running Richer w/ Carb Swap

RustyRatRod said
The jets have absolutely ZERO to do with idle mixture. Nothing, nada, zilch. They are on the power circuit, which comes in well above idle. That list number is a 650 spread bore, vacuum secondary carburetor. They are really decent carburetors and can deliver a great mix of power and mileage. I would not suspect the carburetor RIGHT away. Where is your initial timing set? If it's not advanced enough, that will cause it to run rich at idle. That's the first thing I would look at.

We set it at TDC before buttoning everything back up, but have only done timing by ear at the moment due to broken timing light. It runs and responds to throttle really well, but is just richer than Jeffrey Bezos. Tonight will be timing with a light, checking vacuum and fuel pressure along with a pulling plugs and taking photos so I can update this post with better info.

I appreciate both of your guys' help so far it's opened my eyes up to things I wasn't considering