Venturing into the gasser side

I know these cars have issues with wiring harnesses besides the head gasket a on the m104 engine. Anything else I should worry about? I’m picking the car up for $400. It’s very clean besides a broken windshield.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k