Pretty nice looking work. Should work well. You will lose suction at the highest point on the manifold that is drilled out, but as long as you account for this dead space you should be fine.
Homer: “I’m feelin’ low, Apu. You got any of that beer that has candy floating in it, you know, Skittlebrau?”
Apu: “Such a product does not exist, sir! You must have dreamed it.”
Homer: “Oh. Well then just gimme a six-pack and a couple of bags of Skittles.”