what kind of oil for new rebuild

I always used conventional "race" oil for break-in because it had the most zinc. Diesel oils also had a lot but those are being reduced too. SM rated oils, the latest, including diesel formulations, have the least. I have a couple cases of the older conventional diesel oils but may add break-in additives even to those in the future. One would have to do some serious research to find specifically what the latest oils have, or don't have, in them.

After break in, Amsoil synthetics are all I use because I've seen the benefits in my race car and tow truck. No additives needed.

Anybody see/post this article? Lots of good, educational info:

http://www.hotrod.com/techarticles/engine/flat_tappet_cam_tech/index.html