Ok, I just did a search on "L-Gata". Didn't bring up a whole lot. Isn't the normal compression ratio in a Z Engine close to 185(I could totally be wrong here, I know standard cars don't run that high). I think the top half was more focused on the Carbs then the Chamber Heads.
The end goal with the Engine, and from what he wanted to do.
Bored and stroke, turn it into a Short Stroke, after that I pointed out the possibilty of turning the Engine into a Twin Turbo. A long shot at best, but the goal would be a total monster by the time I got out of High School. The plan was really to work on a 260/280Z, because of the Wishbone Suspension. I never really have seen a older Z up close. So my info might not be good for crap.