a top the sc is a tree with 3 vac ports, one to the brake booster, one to the boost solenoid, and the 3 rd is the hvac vac line, it runs to the fire wall, then to the pass side fender, down under the fuse box where it could T ( some have a T some dont, if you have a T one side runs across the front rad support to a vac ball. the other side merges with a loom of wires under the fuse box then runs into the cab of the car.
if you pull the pass side carpet up you'll find the vac line coming in the car and follow it to the box it plugs into.
see the line to the fire wall?
