ZXR with ZX9 motor questions

Thinking about putting a 900 motor in my J2 ZXR 750
What is the easiest ZX9 motor to put in?
Do i use my Carbs and airbox?
what do i need to modify or change?
Cheers
What is the easiest ZX9 motor to put in?
Do i use my Carbs and airbox?
what do i need to modify or change?
Cheers