Not trying to sidetrack my own thread but in case anyone cares, here's some supporting info on the aluminum 225 slant six.
Here is a little background and history on the Aluminum Block Slant Six engine
An Exotic Slant Six | Hemmings Motor News
An interesting fact is that a hemi six was made in versions over 300 horsepower (factory) by Chrysler Australia in the 1970s.
Chrysler Hemi-6 Engine - Wikipedia, the free encyclopedia