The cast in place valley plate works with stock intake port height,we use the Indy or similar valley plates on any stock style intake such as X-rams and use the plate under it.You can also make spacers for the end rails,we have done this on blower manifolds and Indy raised port heads.You can tap the block rail and countersink the holes in the spacers and use capscrews to attach.Add a thin bead of silicone to the block side attach the spacer,silicone the manifold side and be good to go. There is more than one way to skin a cat but always start with a dead cat.