The zetec doesn't have the same room problems that a SVT does. Like, I could probably put an air-air intercooler down low between the tranny and the firewall, and get fairly cool air when moving. (Of course, I'd have to watch out for loose rocks.)
I do wish I knew what a "squish area" was...
I wonder what would happen if you put a steel shim between two stock head gaskets. I mean, if one stock head gasket is good, two must be even better.