All good advice, but I would add one more thing. Make sure the radiator is functioning correctly. And you can't just go by how it appears to flow. A restricted radiator is the most common cause of overheating the motor and destroying the heads in the P38. I would seriously consider overhauling the radiator on an annual basis as it is not uncommon to find it is significantly restricted after only a year after a flush. There may be good replacement radiators available now, others here will know.
When I purchased a 1999 P38 in NZ about 8 or so years ago (sight unseen, but I knew the owner and the company only wanted $1,500!) the mechanic who regularly serviced it (very well) said the radiator appeared fine and flowed well. But because I had seen many P38 radiator failures I insisted he get it flushed. He was completely surprised that it turned out to be 30% restricted.
2013 D4 expedition equipped
1966 Army workshop trailer
(previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE 3.9V8 then HS2.8)
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