Did anyone else notice that the carb looks very much like the Rochester carbs used by GM in the 70s and 80s?
Great carb. Biggest problem with them was the float sinking which raises the fuel level in the bowl. Also, ethanol did a lot damage if allowed to sit for long periods of time. I think you said it had been sitting for 4 years.
I don't want to get started on ethanol and the damage it can do, but I am afraid it may apply here.

Paul

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84 500 SEL (307,xxx miles)