Common Procomp crosswind intake manifold problem.

This is just one of the problems we encountered with one of these pos joke manifold.
The angles on the manifold (where the bolt heads seat) where corrected in a mill. The manifold still had to be faced to even fit properly. And even then, it still seeped coolant into the oil. So it got taken off, and thrown into the corner in disgust.
The worst part is that when the stroker kit was ordered (From Muscle Motors) a genuine air gap. And they sent us that not fit for purpose chunk of scrap metal. Not to mention other claims them made which were lies. (but that's another story)

My advise, by one at your own peril.........