I'm replacing my IP on my 7.3 Idi(the motor is out and its a bigger injection pump then stock) I'm wanting to advance my timing 10-12 degrees. I have no clue where to really start on doing this task any advice would definitely help.
First, welcome to the forum
Why do you need a bigger IP? The NA 7.3 can only breathe so much air. Unless you have a turbo and didn't mention that
Either way, that's too much timing, especially for a turbo engine.
I agree you need to search and read more threads here. But to begin with, line up the mark on the new pump with the mark on the housing. That will get you close enough to run. Then you need a timing meter, or borrow one. Far more experienced members have said they can't get it very close by ear.
Also, I don't know your experience level so hopefully no offense - never loosen the three nuts or try to change timing with the engine running...