vacuum issues

i have an 88 mustang gt and rebuilt the 302/ 5.0L in it so it starts and everything no codes thrown but a little concerned on the vacuum, the back of my performer rpm has 4 places for vacuum (well 3 i guess since the one is pcv) but anyway i have the main source (at the btm of the intake) plugged into the souce on the vacuum tree. then on top there are 2 smaller ones. I think one plugs into the map sensor? and the other goes into a 3 way with the emissions and fpr? correct me if im wrong! btw if you are facing the car the one small vacuum line coming out, thats the one going to the map, and the one on the left is going to the fpr and wat not... the car is maf also with no smog pump or lines to it... correct me b/c i believe im wrong.

doing some more research and with being converted over to maf wont i need a barometric pressure sensor instead of a map sensor? idk another question i just stumbled upon this car is a mess that i bought from someone else thinking 3 grand was a good deal...i have already stuck another 2500 just trying to get her back up to par! including 700 dollars in floor and floor installation!