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Only read the link and the first 2 pages, but sometimes, if your combo can't be geared optimally, camming it with a way-late intake closing can do wonders for MPG as well as for upper-RPM HP. Delaying the cam is contradictory, because while the later exhaust opening will help MPG, it will hurt upper-RPM HP, and that may seem to balance out the gain from the intake closing, but in testing it doesn't work out.
Also, excessive-overlap cams can be taken more advantage of, but they drastically hurt emissions, so I won't explain further. Long story short, you don't want any overlap at 0.075" valve lift. That'll keep the emissions clean enough to pass testing.
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