5.9l magnum swap questions

Well other than checking the oil for coolant, how else would I know if the heads in a junkyard engine are cracked?

As for the cam, that's all that was mentioned in the thread I found

Are you doing a full rebuild or just changing out the cam and running it? If doing a rebuild have the heads checked for cracks. Usually a cam in the 230 or so @ 50 will have a little lump to it, the overlap and LSA play a big part in that as well.