Anthony the work that needs to be done to the intake costs $600. The Strip Dominator works well with the right mods and its the manifold I used on my 11:1 cast iron oval port(215 castings) headed 468 that made north of 700HP
but I do agree if the heads are not right you're wasting your time, focusing your efforts on the intake. FYI, the plenum needs to be shallower not deeper.