I think that alloy head is a copy of an iron head that was produced in Australia. There are better performing cross flow heads from Australia for the small Ford six, OHC variants. The Barra, last produced in 2016 is truly special. You get some ideas of how Chrysler might have progressed the slant six if inline sixes had been as popular in the U.S.

The point of my post was that it IS possible to produce a performance aluminum head for a niche market engine and it has been done for the Falcon six. It does appear to be the best option for the Falcon six as a bolt-on that doesn't require a host of new parts and a reconfiguration of the car as a cross-flow head might. IF anyone (not me) ever does pony up and see one through for our engines it needs to be one very similar to what was produced for the Ford as it would appeal to the most buyers. I mean, this is the internet and we are BSing about aluminum heads and such. $0.02

The reality is, for an aluminum Slant head to ever happen someone with a lot of cash to risk will have to just build it... This guy is on the right track... I have to guess he either owns or works for a big machining company and this is a side job.