2004 KW T300 C7 questions

Hi everyone looking for opinions on what I need to look at to get a new (used) engine for my truck. It's a c7 cat 300hp in front of a 10spd.

What years of engine will work?

Will any HP version of a C7 work if I use my injectors and Ecm?

Does it matter if the engine was hooked to a auto or standard?

My engine has a connecting rod through the side of the block

2004 KW T300 C7 questions