I got this car in peices. It sat in a garage for 6 years before i bought it off this old lady. Im litterally just slapping parts from the trunk onto it. Doing an egr delete, got an expedition 5.4 passenger manifold and flange. Doing a cat delete also. My question is, is the very back port on the passenger head on the intake manifold surface on the head a coolant passage? I think the previous owners had pi heads rebuilt cause the oe intake is not covering said hole, even the intake gasket is over this hole.

do i need a pi intake manifold?