that is freakin awesome Steve!!!
what kind of torque at what rpm did it make?
How hot is too hot for the IDI head? at what point do precups start hitting the hood?
maybe 1200 is a little more reasonable for the amount of time you need to be under power?
Along with iat temps after cooler, can you spray water to keep it cooler?
Also, quite a few guys have had excellent results with Power Service silver bottle with cetane booster, it will help the fuel burn faster, and keep egt's down (like 50dg, not a TON) because fuel is buring more in cylinder.
can timing be advanced a degree or two or three to keep temps down? or will that bring your cylinder pressures too high? (result is more power, but much lower life expectancy)