Oh Jeff, it seems your enthusiasm is as diseased as mine. Mine came up good, after careful examination, I think the threads in the castings just don't withstand years of having the nuts over-tightened. Perhaps if bad just get some slightly larger studs and re-chase the threads to suit, you should be fine. Drilling the mounting holes on the coil packs a little should be okay, as per the covers and earth straps, etc. Yes it'd take time, but then the problem is gone forever.