Helping a friend with 1996 p/Stroke

I am trying to help someone with their 1996 P/Stoke. Please forgive me as I am clueless about the P/stroke. My knowlege is in the 7.3 IDI motor. The truck my friend has is pouring oil from what he thinks may be the rear main seal and other places. He thinks or knows this was caused because of spraying either into the engine while trying to crank it. The Either ignited and blew the plastic apart from the intake. This resulted in the oil leaks when he drove the truck immediately after. Remembering that I am cluless about the physical parts of this motor please tell me what could be damaged and their location so I can investigate his problem.

Thank you for all help in advance,

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