you wouldn't think it could be much. I took mine off and installed it in 4 hours total, and thats in the shed, without a hoist and doing it for the first time ever so it was really slow! Plus i was on my own.
I reckon it could be done in half that. So 2 hours x $75, as a rough kinda price. Modifying oil lines etc would be more though, no idea about that.