Thanks Steve for posting the 540rat blog. It was actually this blog which prompted me to re-think my use of ZDDPlus added to Castrol GTX and to start that oil thread a few weeks ago. One of the Joe Gibb's oils (for modern LS engines) did rather well in the 540rat blog, which is why I contacted that company several weeks ago. It was Lake Speed at Gibbs who instead recommended their "hotrod" oil for my rebuilt engine. I appreciate the 540rat blog because it got me to recognize that creating my own oil concoctions might not be the best way to proceed. But there certainly are plenty of criticisms of the methodology he/she uses, which is why, in the end, I decided to trust the advice of one of the companies which designs/specs the oil itself.
In the end, I am the first to admit that this is all somewhat silly since few of us will use our Healey's to compete with those MBs and Volvos for the most miles driven between rebuilds. But it is nice to understand each component of our cars a little better and to treat our cars as nicely as possible. Thanks everyone for being part of one of the few forums out there that can discuss oil without it all spiraling out of control.