Welcome to TheDieselStop
There's a wealth of info here, and members are more than willing to share.
There's a specific forum for the 6.0L Engine - Upgrades and Aftermarket. I'd suggest you post your specific questions there.
You can also post your parts wants in classified forums.
BTW, suggest you turn off caps lock. Makes your posts hard to read, and implies SHOUTING.
No idea about the price, but someone will be able to give you an opinion. The 6.0L isn't known as a dependable engine by many, so may be worth less than a similar 03 with a 7.3L.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, 6spd, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, Jody's 80 HP Econo PCM (classic version

), AIS,
coolant filter w/"hokum" bracket, regulated return,
heated mirror mod, lighted cupholder, Marinco heater plug-in.
Hard or no-start? Check here