P400 Block Assembly Identification

[northwester]

Hello:

Considering purchasing a P400 long block assembly for use as a marine engine.

I'm working with a vendor who has a long block for sale that was ordered from AMG in 2013. According to the vendor, the AMG part number of the block is GEP12562496.

My question is, are there casting numbers on the block casting some where that can confirm it's the genuine item with a forged steel crank and all the other improvements. It's a 506 block as can be seen in the attached images.

Also, how do I determine it has piston oilers for all cylinders?

I'm naively assuming I can fit this engine with a DB2 pump calibrated for 160 hp normally aspirated operation under pure mechanical control and a high volume water pump to keep it cool under continuous use @ 2800 RPM.

Your feedback is appreciated.

Thanks,

Mark