[mr0077]

Ernie, just another thought...wouldn't you get the most useful EGT reading under load at a given RPM, say 3000 RPM, where the total advance is all in? I'm not sure the idle EGT is a reliable comparison between two motors that are so radically different from each other. In airplanes, you take off full rich, and when you get to cruise altitude you start leaning to peak EGT, then richen it up about 100 degrees (to make sure you don't get near detonation). Seems like idle EGT is an interesting but not terribly useful reading, maybe?
Now just how ya gonna read the EGT under load? Maybe on a chassis dyno?