I'm going to the local u-pick to get a LE5 Manifold or my eco cav... just had some questions that I can't seem to narrow down

1- what other parts should I look for? injectors? etc..
2-where can I get this adaptor plate I hear that I need?
3-does anybody have a straight forward write up on how to do the swap? pics would be fantastic!

I have searched on here but every form seems to run off into something else

I know I need to get a tune afterwards to get the full benifit..

p.s. my motor is stock 03 eco right now, I have a spare 02 fuel rail, should I use that aswell?