Intake install question

Howdy, I have a question concerning an intallation of Edelbrock Performer intake. Mainly, it has to do with the removal of the stock lower intake. When I did it, imagine my surprise, when I saw dirt underneath the intake, in the lifter valley and in the "spider?" that holds the lifters. What is up with that????? Also, I noticed that my cork endgaskets were almost like missing and there was a lovely combination of grime, dirt, oil and coolant?? near the gasket under the intake. Can someone chime in and help???? It is the first time that I have put in an intake manifold and I didn't know that the inside of the engine could be dirty....is there any way of cleaning it completely??? Thanks for any replies.

Thanks for reply, re: crud, it looks like a combo of sand/dirt and oil and it is everywhere, including the pushrods, spider, surfaces, etc...I have noticed that there are two holes at either end of the block, do these allow for drainage of oil or are they just vent holes? Can I just flush all the crap out with some solvent and hope it ends up in the oil pan which I would first drain??

Thanks guys