If it hasn't been rebuilt, I wouldn't bother with break-in oil. Any modern oil should be fine. I'm planning on adding some ZDDP when I restart mine (I did have to replace one lifter.) Otherwise, I plan on using some Valvoline VR1 10w30 I got a good deal on. Otherwise I'll use 15W40 diesel oil that I use on my daily driver. I do have a bypass filter that'll be on it.
