The SB stuff should be a no brainer. You'll be able to tell the change gears (if it has them) pretty quickly. Ditto Morse Tapers, chucks and whatnot. If it fits the SB in any way, it's his. If it doesn't, it's yours.
Gosh you get to do the REALLY fun stuff. I once had the priveledge to help an older fellow sort out some stuff as he was "cleaning out."
He says "Here look at all this and tell me what you want. Anything you want put in a pile over here and I'll look at it later and keep what I don't want to let go."
That's about as close to nirvanah as I can get. Even a trip to the dump isn't as much fun as that.
I picked out many things, he found he didn't want to let go of a few (very few,) and I came home with a couple of good box fulls of mikes, LS Starrett stuff, planer jacks, and other miscellaneous tooling.
I think you'll find this is one of the most FUN $150 you've spent in a long time. Of course you haven't moved the mill YET. Then the fun really begins.
Just kidding, you'll do fine.
Best,
Joe in NH