Warm Engine Idle Issue

It's fixed, for real this time. Unfortunately I can't pinpoint exactly what the fix was due to all the stuff I threw at it while I had the chance. Below is what I did.

- New plugs/wires. Really don't think anything was wrong with the originals.
- Pulled carb and adjusted transfer slots square.
- Installed a fuel return line using a 3 way filter and the tank vent line that runs up to the engine bay as my return. Have a vented tank cap.
- New gas tank and filter sock. The filter was disintegrated.
- Blew out return and supply lines with compressed air and changed all rubber hoses.
- Cleaned the fuel pickup assembly tube with a 22LR barrel brush and snake since it was corroded.
- Insulated all fuel lines in the engine bay.
- Installed a Holley carb heat shield and gasket.
- Installed a 195 deg thermostat. Had a 180 in there before.
- Installed PCV valve. Two breathers before.

Thank you everyone for all your help and suggestions!