...BTW your Bieber avatar is awesome.-Malone
I believe the "wear-in" philosophy would tend to result in a broken camshaft as it would be under tension. Tell you what, let's put one on that old blue stinky car and see who is right! Game? We can set up a little "office pool" with mileage guesses. Man, THAT sounds like fun.
when you resurface a head the valves will sit lower in chamber, if now you set valves back in some the cam will open valves farther, now you straighten cam bores and cam opens valves a little further. if now somehow you can economically adjust for this the head might work.