Personally I think that's a VERY poor example. What we are talking about here, is something people can afford, swapping into an older car. The LS or at least "some of it" are available OEM. What do we have? Not so many Rams with 200K wore out Magnums? And, really, the Mag was just a "mild rehash" of the LA platform, suffering many design faults along the way
In other words the quantity, availability just is not there. Maybe "the same outfit" who makes EQ heads could be persuaded to do a "ripoff" casting of W heads