I was planning on keeping it for myself since, like you said, using a 413 industrial motor for a buildup isn't what a lot of folks like to hear.
It's a '72 model.
I actually got a package deal...three 440s and this 413, all four w/ 727s attached. Too good a deal to pass up...guy was moving out of state and couldn't take them w/ him. Was a lot of fun loading these heavy suckers under a shed w/ a soft dirt floor using a cheap flimsy harbor freight engine hoist.

I won't likely tear it apart anytime soon. Well, except to remove the topend. Wipe some grease on the bores, wrap it up, and stick it on a pallet in the barn to save for a later date.