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As I said expensive. Put that kind of money into a Duramax or a Cummins and you are way north of a thousand HP, just saying.

The 6.5L Detroit suffers from some of the the same problems that plagued the 7.3L ford, one is they did not do enough to keep the heads on, you can quickly get to the point that you start to "lift" the heads and blow a head gasket, fixing that short coming can be rather expensive, this is why...

I am running a modified Dmax fan and clutch, 0-60 about 6 seconds (would be less but I keep forgetting to put it in 4WD and allot of time goes up in smoke) vs 27 in my 6.2L helmet top I went with the cheap Champion radiator seems to have decent build quality

You would probably need to replace the radiator with an aluminum one, that is what I used on the DuraVee and the temps are completely under control even with the 435HP tune, but the Duramax is a much more efficient engine than the Detroit.

I really have no answers, but I am curious as what engine you are starting with (GEP?) and why a mechanical driven compressor is preferable in this case over a wasted exhaust energy recovering turbocharger? Certainly EGTs will be your limiting factor not raw HP