Search for a Partner 350 cylinder /piston kit on ebay ~$30. They fit the older Poulans (~1990-2005). Look for the 2 diagonal screw intake manifold.
Ah, thought we were trying to lower idle. I'd agree with above comments...try a new $15 carb. They're $10 if you wait for China ship. I know I...
Maybe you say it differently...but Idle/TAS/LA screw should be OUT to decrease idle. Counterclockwise = lower idle.
It should be a standard fuel pickup. Could be located way on the other side from fuel cap hole.