Blown Mercruiser 5.0 Alpha. Low hours. Replacement options

[keith]

Is there a difference on the installation for swapping my carb (alpha) motor with an mpi 5.7? If they can't get it done in time I am debating on doing it myself at my friends shop. I don't want to get into anything too crazy though.
Is the harness the same?
Will the exhaust bolt up?
Do I have to change anything in the outdrive?
Is the fuel pump on the engine?
Is there a return line, which would mean tank modification?

Thanks