Before you start, I suggest having a plan for --
* cooling
* fuel lines
* throttle linkage
* exhaust
* alternator wiring
* clutch linkage

Compare the two engine's needs and determine whether or not the existing parts can be reused. If not, accumulate the necessary items into a kit that has everything there. Otherwise, you'll discover that something won't work during the swap, and it will be 7PM Sunday night. That will delay you by a week or more.

Guess how I know this.

regards,
Leon