Yeah, good point. I have done it both ways (engine in-vehicle and engine and tranny pulled) and suggest keeping it simple. Do the PHH, vacuum lines, fuel filter but stuff like the front main seal, oil pump seal, can be done at another time. One exception to keep it simple mantra might be the oil cooler check, clean and seal: it's an easy job with the exhaust manifold off.Just be careful of the dreaded while your in there the paranoia can be time consuming and rough in the wallet. But I went down that rabbit hole when doing my head gasket. I looked up one day and it was 4 months later and still not back together lol. It is now and 45,000 miles later still running great