3406e @ 550 to 625hp 2WS Motor

Hello guys,

I've recently cracked my head in my engine, it seems to me nothing else was damaged or anything was bent... must of been a welded head from a rebuild place that the previous owner had on there. Now right now I have it set at 550hp, what would it take for me to go to 625hp with a little more torque. The cylinders and pistons and main bearings are all fine so it the cam shaft. My injectors were old and not rebuilt, so right now I am having a new set done for me. They are going to rate and renozzle them for 625 what else would it take to get to those numbers on this 2WS model engine. Will the stock turbo support 625, or am I going to have to go with a turbo sway to reach those numbers.

 

OK so little update... new injectors are in new head new Turbo... high egts temps for some reason. Also little oil smoke after idling for some time. The boost gets up to 30 psi. Any ideas