SR20DET vacuum hose routing

[AKADriver]

My friend recently brought home a car with a redtop S13 SR20DET swap already mostly complete. However, there's nothing connected to the three vacuum ports on the intake pipe after the MAF. There's also nothing on the PCV intake port on the valve cover.

I know one of these ports is for the BOV, and the car has an HKS BOV, so it's fine to plug it. This is the top-most port, correct?

The car actually runs as-is.

Here are pictures of the open holes. In the last picture the hole is covered by a piece of tape...




Thanks!