Sweet. Thanks for your help Markus.
I didn't think it was an '87 -- it looked too old. The gas tank is metal, and full of rust -- not just rust, but rust bubbles. I'm going to try cleaning it via electrolysis this weekend. If it goes well, I'll reuse everything I can. This motor will likely be rebuilt from the bottom up. It needs some tender love and care. I might put it on my Duster when I'm done.