I went through a long process of selecting a builder for my sheet metal intake for my hemi. Spoke to many vendors and some very reputable and others not so much. What I learned was that if you want a custom intake find some one who has built exactly what you are looking for previously. Meaning they have the all the tooling and jigs to build a manifold that will fit perfectly. If not you are looking at sending block and heads to get it built correctly unless they happen to have the a block with same deck in house. In the end I selected Hogan to build my manifold. It was not cheap but in my opinion really good value.