Are these numbers for RPM based timing only, because the curve looks weird. As RPMs increase, the timing advances, then retards, then advances again. It looks like there are other things affecting timing, like MAP and load sensing stuff. An RPM base timing curve would be a more steady increase.
thats about right for the std engine, what you have to remember is that this engine has 2 inlet systems that have very different flow rates,
Also this is only to get us started you/we really need a way of metering knock and a dyno to get the ign right for our different applications of the engine.