my 2cents, looks like a bunch of money with very little gain. If I was picking one of those it would at least be the one at 274*....most of the 5000-up stuff should be in the 280's (at least) and lobe seps of 106-108. Unless you have some of the stuff laying around (springs, shims,cam,lifters,pushrodspotentialy) your going to be looking at around a grand$