Cool. I sent him a mail.
I can't tell from his website if he's ever done this before - I have to assume it can be done, particularly since we're not dealing with altitude changes on an airboat.
Could be fun to work out, too. 8 spark plugs, upside down carburetor, low RPM and all sorts of other interesting things that would bring a weird resolution to the tuning (for example, it idles at 600rpm and redlines at 2750)