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Here is my understanding, please chime in if anything is inaccurate. 6.2 and 6.5 heads are interchangeable with the following considerations: 6.5 Turbo heads have a different angle on the injectors. This was to increase the clearance for the turbo. Generally you can use the 6.2 injector...

Another issue with the DMax is clearance. You will have hood and cross member clearance issues that will need to be addressed. The DMax is a taller engine and the older body styles are not set up for that tall of an engine.

Like Rick, I pull the heads as the old print-o-seal gaskets are a known weak point. I have been using the updated fel-pro gasket sets and head bolts for years with no issues. Some use the 6.5 head gaskets on 6.2's but I do not.

Just a suggestion. You do not need to pull the engine to inspect the bottom end. You can pull the oil pan which will alloy you to inspect the bearings, crank, webbing etc. It is a little cramped, especially up front but very doable and will give you a much better understanding of this engine.

Not an endorsement as I have never worked with them, but others here have: http://leroydiesel.com/

Assuming from your post that this truck has value, utility and meaning to you that warrants an investment. A few things that will help us if you don't mind: Sounds like you have the necessary equipment and means to swap an engine yourself. Please confirm if not. What is your budget? I...