Well that is not good news. I can only imagine how you must feel after just completing a complete rebuild.
A couple of thoughts- If the rod bearings were ok when you pulled the engine, it is hard to imagine, although possible, that something could have been introduced into the oil that could damage a bearing that quickly upon restart. There is a check you can make to determine rod or main bearing problems. One knocks on accel, the other on decel - maybe John Walker will chime in here. You say the oil pressure was good...what about cam timing? Valve hitting a piston? Are you sure your cam timing was right? What about wrist pins? You notice I am mentioning things you *did* remove, where there may be a chance something went wrong. Hopefully someone else can tell you some other things to look at before you pull the engine again.
Good luck.
Tom
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