I want or do a hemi swap on my 2002 dodge 1500 5.9 single cab just want to know everything I need to do this swap reason for doing this is cause I want to be able to push 400+ Hp That's my goal

 

You can do that with a built 360, more if you stroke it out. Then you don't have to worry about electronics changes, transmission change, etc.

 

Engine, transmission, PCM, wiring harness, probably the instrument cluster, etc. as stated, easier to build the 360.

 

What should I do to the 5.9 to get it to 400 hp I want to do a complete rebuild but I don't know what kit to buy my limit is 4000 with the rebuild I was thinking of getting a donor hemi for about 3 cause it pushes 345 hp and I was hoping to get to 500 hp max without a cam

 

You wouldn't get 500hp out of a 5.7 without a cam unless you supercharge it (and not in your budget). You can do a strong rebuild on the 360 and add a blower. You asked for advice and have received it. Up to you now, it sounds like you're hell bent on doing it, so post pics and let us know how it goes.