Did the engine come standard with a turbocharger? If it did you could simply replace it with the original factory turbo..
EGT over 800 deg C is very high i would be rather worried about your fueling is it leaning out?
If it isn't factory turbocharged I would recomend a Garrett GT25, it will boost up very low around 2000rpm on your engine and with a 4 into 1 equal length exhaust manifold custom made from steam pipe bends it will make great power and torque. If you run low boost you may not need to fit an intercooler to it, but i would check your inlet air temperatures and use an aftermarket engine management system to set your fuel and ignition curves correctly.
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