This engine does have my interest. My biggest concern is the double overhead cam. Does anybody know what the probabilities are for cracked heads, blown head gaskets, etc? I am currently dealing with these issues in a Grand Am (4 cyl) it's a whole lot more complicated than the old inlines.
I would also be more interested in an old school conversion for this engine, as noted earlier, possibly with a single Holley carburetor and without a computer.
Although, if the complicated parts could be simplified, it would be tempting to at least consider an EFI set up.

Sure sounds like a heck of a lot more fun than the usual V8 set up. But, as for now, I am just reading your post's and sort of thinking out loud (online even). But if you seriously think about it, this could very likely be the next rave.
John