Please, please, please post the results.
This is the greatest fear of all fresh engine rebuilds (apart from blowing up on first start!) so I personally would love to know what went wrong so we can all be more vigilant in certain areas when building our engines.
Hopefully it's something simple like oil surge from a lack of baffling in the sump or something like that.
Best of luck with finding the cause. Even worse than than the result is not finding something that categorically caused the fault, leading to having to rebuild it and hope for the best....