no oil pressure

The most likely scenario is a lifter/push rod/rocker arm problem. Once a lifter gets kicked out of the hole you have zero oil pressure. Seeing as how this is a new engine the ability to kick a lifter out is very likely. I would start buy pulling the valve covers. Second if everything looks good there, I would pull the distributor and oil pump drive shaft and inspect the shaft for being broke. Next i would use a priming shaft to spin the oil pump. If you still haven't found the problem, the oil pan needs to come off.