SB Mopar 671 manifold for sale, not mine

casting involves lots of work, making the sand casting cores for the runners, outside green sand casting for the external dimensions, final machining for the gasket surfaces and drilling the mounting holes. It would be easier to adapt a tunnel ram: Mill the top as low as you can to retain the dimensions of the blower output and waterjet cut a flange for the mount. You can get a sheetmetal intake fabricated and they can probably make it for a blower top. https://www.weinlemotorsports.com/Custom-Built-Intake-Manifolds