New Small Block Stroker Engine Noise

Here is a video of my newly installed 414 small block stroker engine:

http://www.youtube.com/watch?v=WME_uQHXjJA

The cam is a retrofit hydraulic roller, lift 586/540 and 236/246 @ 50 intake/exhaust. I would not think it would be this noisy. I adjusted the valves on the stand with intake off prior to installing the engine. It was much louder on one side, like knocking, so I readjusted the valves, now its about the same noise level both sides.

Engine probably has around 1 hour of run time on it. It had just got up to temp when the video was taken. It does seem to get quieter the more I run it. Oil was changed after the first 20 minutes and only had a slight trace of silver in it, nothing else. Oil pressure is around 75 cold and goes down to around 40 when hot at idle. It will easily climb to 60 hot with a little bit of throttle. Its a Mellings high volume oil pump.

The bearing clearances were checked by the shop and I also checked them with a caliper and dial bore gauge and they were perfect so not likely rods knocking. Pistons are KB745 forged step dish with .0045" piston to wall clearance as specified by KB. Block was milled to put pistons at zero deck, .039" head gasket, piston to valve clearance was more then .100".

I don't think it should be as noisy as it is.
Is there an issue here and what should I be checking?