i'll have to look under the hood again in the morning (with my 88 service manual in hand) to see about the green hose from the vacuum switch you refer to

about the other hose connected to nipple 3, i'm certain it connects to the top nipple on the 6-sided-thing-a-ma-jig ... it could be that one of my mechanics in the past year moved the hoses to where he thought they should be, but i doubt it ... maybe others will chime in

btw, if you have other immediate questions, ask them tonight and i'll try to look at my carb again in the morning ... after that i'll be wheelin in Livingston, KY all weekend and won't be able to post back until Sunday night