Tom, I've seen the S-Max stuff before. I work with a guy who used to be part of their west coast operation. I'm not real big on expendables but it's worth looking into.
BTW, do you have any insight on intake/exhaust manifold sealing for turbo motors? I'm a bit leary of only having 6 studs to hold down both manifolds. This is what has lead me to the Fontana midget motor head. The intake is on a different plane than the exhaust so each has their own sealing surface area. Have you had any issues with your stock head/manifold configuration?
Nate