Im in the process of purchasing a 6.4 with 151k in milage. Anything I should expect from this motor with this many miles on it. How about the egr and dpf delete? Ive been reading up on this seems to be some good and bad any suggestions?

I have a 79 Bronco that needs seals for the side windows on the camper shell. The window has a solid half quater slide and a small vent window. Anybody have any ideas on where to find the seals?