Rough-idling 360, can't figure it out!

Get a spray bottle of water and spray around at every gasket on the intake and check for vacuum leaks. Don't use anything flammable, that's dangerous and water will show it up just as quickly. Spray around the vacuum booster check valve and where the hose connects on both ends. Around the carburetor base. All around the intake gaskets on both sides. Anywhere there might be a vacuum leak. That's the number one cause of a rough idle.