D4B DC mods like the LD340 DC mods?
That's what I'm shooting for.
i'm sure that many will take umbrage at this, but looking back on your spec and ideas i'd forgo the "commando cam" or the E4. don't get me wrong, it's a cool cam if you're going for that type build but i think that there's many improved, more modern grinds out there that would suit what you're doing a lot better.
the stock 9:1 will be plenty for a broad range of use and should run on pretty much any fuel should you get jammed up while out and about. if you wind up needing to open it up, then i'd burn that bridge when you get there.
double check the primaries/secondaries on the carb to confirm that it's a "small" rather than the bigger 750, which i think would be too much carb for what it seems like you're trying to accomplish.