Just finished putting Ian's kit in my truck... It's probably worth getting one just for the diagrams...
Are they near the front? There is a hose with a check valve from the charcoal canister (under the oil filter) to the throttle body. The hose barb is on the bottom side of the TB, where it meets the upper intake, pointing straight down. For some reason, the stock setup runs the hose into a plastic U, which is hooked to the barb with a rubber elbow.
Near that is the main front vac source. That barb is pointing directly at the passenger side.