I took the primary fuel bowl off and metering block and blew them off really good with carb cleaner. I also took out the idle mix screws and blew those passages out with the cleaner.

Anything else I should do? The fuel bowl and metering black had significant rusty silt in them.

I have no idea where all this came from! The gas tank was replaced 4 or 5 years ago with along with new SS lines. This car has been under resto almost since. I tore down the carb and cleaned it out not a few months ago! To say this is annoying is an understatement!