What to with a fresh rebuilt motor that has been sitting 3 years?

I have a fresh rebuild 318 in my project car. It's not been fired yet and still has all assembly lube on cam etc, etc. I bought the motor complete carb to pan almost 3 years ago.
For the first 2 years the motor was in a cradle in my garage, and the last year it has been in the car dry.

I won't get the car home until the end of summer. I then hope to get it wired and plumbed and fired up!

The car is now in storage while I complete renovations on a new house and garage.

What if anything should I do to the motor? I was thinking a shot of Marvel Mystery Oil through each spark plug hole then rotate it a few times....

I'd appreciate any suggestions.
misty motor.jpeg mist in storage.JPG