Thanks Gerd. It was tough with no picture, and I didn't find the ad, although, now that I see it, I'm pretty sure that I have seen it before. I also think that it is most likely an 8/35, assuming that it is '22, or later. I believe the only alternative is the 6-cyl. 16/72, and the hood doesn't look long enough to fit the longer engine.
Now if I can just figure out "Rust Still Doesn't Sleep".