They are probably already here but limited to deep-pockets R&D/prototype companies. I've seen stuff made out of sintered metal that was 3D-printed.

They guy that is successful at printing a good B-block EFI manifold for the stroker guys will probably see a nice ROI.

BTW Commando - there's a $21,000 66 300 on ebay you should look at, saw it last nite. Thought it was a dreamer-open/no-bid thing, but no, people have pushed the bids that high. Might be the one for ya.