Confusion when living in the states and buying parts from Australia

I do not anticipate any problems with purchasing a manifold from him. I hope I didn't annoy him with what seemed like unnecessary questions. Im just trying to make sure I'm communicating clearly as to what I need. I have a manifold for a 144 Weiand blower. But I really want a manifold with the abundant sealing face surface to bolt to 340/360 heads without the extra care needed - as opposed to mounting a manifold designed for a 273 with it's minimal sealing material- at least minimal when mounting to 340/360 heads.