[jkeating1]

Your comment about the 4 different hubs brought to mind another LT1 issue that you are probably up to speed on. Refresh my memory. The Optispark ignition was basically the same on the different years and models, but I recall that there was a redesign on the later ones to correct an issue with moisture. Something to do with a drain, or a seal. I remember that there was a retrofit technique to fix the earlier ones. Do you know what I'm talking about? I keep that engine in the back of my mind in the event that I ever have need for a SBC without a distributor, for clearance.