I set mine at 6000 rpm limit, as close to half way between min and half range . I set my timing according to the instructions for using a back up timing light. Used 35 degrees and set pot at max advance. I have always used 93 octane and I get no detonation with it. With stock ign I had to use 93, I'm going to try mid grade soon, since I can take some advance out with the pot. Interested to see how you come out. Let us know your results please.
thought i'd jump in and get ur take on going with the Crane (or some other electronic ignition) vs. the points......I seem to burn through points (more often than I think I should)....also getting some backfire on my 74 XLH....this a points problem? or as u eluded to a FUEL/octane issue? I'm currently running 91 or 92 (whatever is the highest at my local pumps)....can't say that i've seen 93 around here (AZ)