We've been through this with the 7.3l already. Forged rods arnt anything to brag about and a whopping 2 years of powerstrokes had sintered rods. They came out in 2001 for the 02 truck model year. There's no such thing as a reliable 900 hp 7.3l. they pretty much peak around 450-500hp and 800 ft lbs torque for reliability. To get that everything in the fuel and air system needs upgraded, including head studs. Main girdle would be a good idea at this point too. Thousands of dollars invested at this point, reliability will also start suffering they will not hit 250k mile mark without bottom end attention, and many break the earlier blocks, from a casting flaw between the cam and crank journals.
Your truck makes what power it does because it's all factory hardware can handle, nothing to brag about. Heck stock manual transmission trucks regularly dyno 300+ rear wheel hp.
a 3406 is 14.6L not 17L. 6nz refers to a c-15. The 3406e was an earlier engine same 14.6L displacment. The c-15, c-16 and c-18 engines have the same block, all 3 carry different designations. The c-18 has a different crank with a longer stroke and larger bore. Results in a 18.1L displacement. The c-16 is a 15.8L engine larger bore then the c-15. No combination of the parts will allow for a 17l displacement. There also nothing to "shim" for more power in any of them they are all electronically controlled, ie computer needs programmed. The 3406c model was the last you could tweak mechanically.