I wish you lived around here (Lititz, PA). Much of what you suggest is either beyond my ken, my ability equipment-wise or exceeds my current level of ambition. Certainly it probably wouldn't do much good to cherry pick your suggestions. I did take your advice on the valve cover and purchased a powder-coated original and a new gasket.

Though you've convinced me that taking ALL the steps you mention would probably result in a more properly running car, I've been fighting my urge for perfection in things and just enjoying the fact that it runs extremely well and is very "driveable." Essentially I'm in "if it ain't broke, don't fix it" mode. However, I'm going to document all of your advice and if things start to go south I'll enlist some professional help and give them your list.

Meantime, with all the really smart people who own, or have owned, D-Jet cars, you'd think someone would have cobbled together a solid state replacement for the MPS. Perhaps not for commercial purposes, but just as a project to be shared.