LA 360 high idle

You most likely have gunk in your idle circuit from sitting/crap fuel.
Remove needle and spring assemblies from top of carb. Remove idle screws from front of carb. Blow compressed air thru each opening of removed idle screw. Re-assemble and adjust idle screws (about 2 turns out each) is good staring point. Start up then re-adjust idle screws as needed. Turn one at a time until she starts to stumble then back out a half turn or so.