You have the feed back carb, correct? If you look in the manual section> over 216 manuals> then find the Montero and it covers the mighty Max truck. That one has a couple of vac diagrams in there. Sorry but I'm first gen. OH there is also a post in the tuning section. I think one of these might have just what you are looking for.

http://www.mightyram50.net/vbulletin...ghlight=vacuum

http://www.mightyram50.net/vbulletin...ghlight=vacuum