Hello Luke,
I have to disagree with you on the head gasket, I know of 4 separate cases of a blow head gasket ( 2 in a DAF 615DT, 1 in a mercedes and 1 in a Deutz). The problem is combustion temperature and pressure are higher in a tuned engine. This couses an old type head gasket to harden and evenually crack. This can be solved if you make (yourself) a copper head gasket.
If the had gasket holds or if you make a new copper one then your valves and pistond must be able to withstand higher temperatures, your pistonrods have to cope with higher forces etc.
In short I have seen nothing but misery from more than slightly tuning your engine, but you might be right about the drive train, at least on my DAF Ya4440 it is probably capable to withstand 250bhp.
Hope this helpes,
Henk Jan
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