340 to 413 swap out

I have found a good deal on a 413 and 727 Auto trans. I was wondering how much work it would take to swap out a 340 to a 413? Would I need to cut the inner fenderwells? And would I need to remove the power steering? Or remove the heater blower motor and wiper motor? and I was also wondering about the K member, would I be able to use the existing K for this swap? Any help in this will help and certainly influence my decision to purchase this motor/drivetrain combo. Thanks!!!!