I'm assuming they are referring to the brake booster vac. hose, though I've never used that product (for that purpose). On that engine, I'm not sure if that hose feeds all the cylinders though or just one bank, I wouldn't use it if it only feeds one bank of cylinders.
If that's the case, only feeds one bank, you could try the PCV hose if that feeds into a central location on the intake manifold.