I haven't found a vacuum leak but my divorced choke was always open. I found out that since the carb is a q-jet from an Oldsmobile that the choke coil needs to pull the linkage down instead of pushing it up like the Pontiac q-jet. My coil was pushing the linkage up which was holding the choke flap open. The linkage between the 2 carbs is different. I was able to remove and reverse the coil so I'm hoping that helps it run smoother but we'll see.
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