12.7 Detroit rebuild questions

Is it possible to rebuild a 12.7 with rotating assembly parts from a 14 liter Detroit? The truck I'm in right now is a rental and it's finally put me off all emissions ######## with the bad EGR cooler that's putting me at risk of limp mode should the DPF get plugged up enough, and this has reminded me of my desire to build a 14 liter without emissions and won't get me ####ed by the feds at first glance. So is this possible? Would I just need a good crank and an in-frame kit for a 14 liter? Or would I need everything else from a head for a 14 liter to the oil pump? What turbo and injectors would I need for 700 horse? The truck I'm eyeing is a 13 speed, would it be worth my time, the extra size, and weight to go to an 18 while the engine is down given I do refrigerated and dry van work? Thanks in advance

 

Last question for now. Is it worth the time and effort to swap to air disc brakes all the way around on the truck at the same time?

 

My thought as for the engine is because it's a wet sleeve design it should be possible because I don't see why Detroit would have used different blocks or different dimensions for the 11.1, 12.7, and 14.0 because of cost and other issues. If I mess with the suspension I'm going to get a shop to do so because while I trust that I can do it with cars and pickups I'd rather not risk it with a semi because of the magnitude of the consequences, and that'd probably be the new Hendrickson fab'd steer axle and air ride combo. As for disc brakes, I figure if I'm gonna be doing all this I may as well go with new components and so I'd do the Bendix setup

 

That's a bummer. Is there any noticeable longevity sacrifice at the higher horsepower range? Eg, would a million mile engine be reduced to 3/4 of a million? Is there any difference in Jake's between regular duty and heavy haul duty variants like there is with the 3406B Cat?