Detroit 12.7 fuel economy/power

Hello! I have a 1998 379 Pete with the 60 series 12.7 factory 500 horse. The waste gate was pulled off by previous owner and wired shut. My egts are always high I’m wanting to get a new turbo,manifold and injectors with some new programming. In hope that it will bring down my egts pull better up the hills (as it’s a dog) and get some better fuel mileage. Looking for recommendations on what would be the best set up definitely want more power but not looking for a 700hp motor just want to keep it reliable and get some good power with some good fuel mileage.

 

I figured if I’m going to do it I might as well just Do it all at once and tackle what I’m wanting

 

I put a new cac cooler on it the turbo being wired the way it is makes me feel like I’m losing boost at the waste gate

 

My truck doesn’t have a boost gauge wanting to get one put in

 

Who’s Leon? Did that help a lot pulling hills?