My 2-cents 1. Are the carbs used? We used to drill out a lot of orifices back in the day per Direct Connection engine guide 2. Is your power valve possibly bad?
Only by me. They were rebuilt a few years back to stock and concourse appearance. Power valve I can easily switch out and try a new one. Why do you ask? Usually with a bad power valve you have to turn the mixture screws way in. Idle and drivability are fine. Just stinks/rich.
