Of course, you're looking for a 983 or 417 H head, but you need to explore the choices of what to do with it before ordering pistons. The valve and port sizes are nice, but the full open 417 chamber isn't easy to fill and not with good quench. The 983 at least has a quench surface.
If you have good welding available, the usual practice is to fill in the 417 side opposite the plug so it looks more like the 983.
Either one can also be improved (IMHO) by making the closed side a "heart" by adding a V separator, which both improves flow and reduces chamber volume.
Until you know, you can't specify the dome shape, CD, valve reliefs, etc.
