It adds up fast as you end up doing a lot of ancillary work while you have the motor out.

And it couldn't be any further from an LS. There is very little information out there for support aside from this forum. And Napa will not have those last minute parts you may find you need in a pinch. If you choose to take on the project it will take a lot of pre-planning and parts acquisition to keep the schedule moving. Otherwise, expect ample down time.