Here is how I do it on alky.

I am concerned about moisture so I come out of each valve cover at the front, go into a breather tank that catches the moisture so I can drain it, then come out of it to the vacuum pump.

I don't think its a good idea to suck any oil and water through these pumps so that's why I put a catch can between the engine and pump.

Will post a pic of my setup after while.

Finishing it up right now.