Re: distributor?
Steve, ask John Gerber (WindedV6) about his experiences with the MSD distributor. I think it may have cost him a motor (can't remember for sure) but I do believe it was randomly advancing his timing and MSD basically said "hmm, sorry".
I believe you when you say you have had good experiences with it. But my point of view is, the stock one is known to work, the MSD one costs 3 times as much and is also known to work but has 1 anecdotal story of major failure. Given that MSD has no proven benefits, and a much higher cost and a small increase in risk, I found the decision very easy to make. Right now I have a $10 eBay 4.3L Sonoma distributor in mine, works just as well as the stock one did (I replaced it trying to chase false knock and when it didn't solve it, I just left it in.)