What is best way to clean all the gunk of the top of that engine? I suppose a towel and some degreaser and a bunch of time is about the only way to do it.

Is it very hard to replace those return lines? Any part numbers for those?

Already scheduled a shop to dip the manifold and crossver at a price of $20. A bargain, as far as I am concerned. They will let it sit for the weekend and pick up on Monday.