I built this for my 914-6 almost 20 years ago, hard to believe. Not sexy, but it worked well and is designed to fit a 914. I found a place near me in RI [Tubodyne, I think] that bent the aluminum tubes. Hardest part was making the injector blocks, early version had the injectors higher as seen in the photo.
Today, the machining would be much easier. I think the high injector position was fine after all. Happy to share CAD files. If nothin else will tell you what will fit. Still have the jig for welding the tubes.
shown
