For those that didn't read the whole story at the link, the TL;DR is that I paid $50 for the machine. And I almost decided to not buy it for $50 but a friend said they'd help me load it up.
It looks to be 100% complete.
The MPU board has quite a bit of acid damage. But everything else looks OK (except for various connectors which will probably need to be re-pinned).
This is Gottlieb game number 666, and the serial number is 1003 which according to IPSND means this is the 3rd game off the assembly line. I haven't done any further looking into the game just yet but I will bust out my camera the next time I look at tape my first impressions of it when I can pull the playfield up.
I went ahead and decided to get a PI-80 for the machine since I have some other sys80s to work on and having a nice master MPU board will be helpful, but that puppy isn't cheap: $390 - it seems to make restoring these games a loss-leader, but it'll be nice to have this guy running again.