Mario;

Excellent advice all around. To which I only have a couple of things to add.

Rifle cleaning brass wire brushes on extension rods work great for cleaning out the oil passages in block, crank and head. I forget what caliber...

After learning the hard way, I now safety drill and wire the cam nut, and across the top of the oilpump countershaft (one of those ba****ds backing out...after 165,000miles cost me an engine! see: http://www.intelab.com/swem/afunny.htm).

Cheers