The guy you NEED to talk to if you are going to try this is Doug Dutra over on slantsix.org or through his email.
Doug has been working on a new head for slants for a long time, I don't know how close he is to casting one but you might get soe good info because he is the slant six GOD! Years ago (I think it was on the old .com site) there was a guy that got a Jag head to bolt onto a slant but the water passages wouldn't line up right.
