Thank you all for the recommendations. I definitely want to keep it as close to "as is" as possible. I will follow those suggestions
And follow up with pics.
I did already break it down a bit to start cleaning it as time allows.
As far as the broken sliding valve link, I did create a CAD drawing of the link to try to get it fabricated but it's almost
as much as I paid for the engine

.
Any idea what material those links are made of? I'm thinking about trying to create it myself.
As far as a boiler strap, it's odd that there is nothing to fasten it down to the fire box... someone just
drilled a hole on each side of the firebox and ran a wire across it to hold it in place.
I will come up with a better solution. Thanks again for the feedback!
Tim