In the MFI case, the factory has already spec'd the advance for a number of engine speeds, so this is already taken care of. For carb'd engines that weren't originally designed for carbs, I can see there's a need to nail this down.
As much as I'm a proponent of DiY, I think this is one of the items that would benefit from outsourcing (in my case). My time will be completey filled with all of the other work I need to do this "off-season," including the home projects that Lu is so patiently waiting for me to attack. As far as car projects go, I still need to buy / install those S calipers of yours, Jamie! Are you gonna cut loose 3.5" ear'ed struts, too?