[CycleSi]

I currently have a Getrag box, but am thinking of replacing it with a Tremec TKO 600. It is sitting behind a Chevy 400ci small block.
Are they interchangeable or is there lots of work involved like changing flywheels, bell housings and clutches, etc.
Ideally I'd like to unbolt one box and replace it with the other, but appreciate it may not be as simple as that?
Lastly, would the gearstick be in the same place?

Thanks.....