New used shop equipment I scored

How on Earth did this find its way here?

 

I scored these somewhere around the late 70s to early 80s. the one and only engine I've ever rebuilt was a 283 that was to go into my '56 Chevrolet, even though the 265 that was in it was likely still in good shape, until I started messing with its lifter adjustment, thinking that I could stop them from clattering by doing so, despite the mill idling smoothly at 450 r.p.m., before I laid my hands on it. That was back in highschool auto shop class, when I was 16. Back then, I didn't even bother measuring valve stems, being eager to use the shop's knurling tool on them.
Now that I don't yet have a knurler at my disposal, this following set is finally handy. For those who aren't familiar with these, the end gets turned like a screw, until the tip has expanded, touching both sides of the guide. There's a ratchet on its end, to keep it from getting damaged. It then gets removed and measured, using a micrometer



After all those decades, I once again get to partially rebuild an engine