Alright. So I went and looked at the engine. Seemed like a proper KLZE. Straight long neck, square runners, KL31-something stamp on the heads.
Didn't like how they stack a bunch of engines in a crate, like eggs. They rub and hit on each other. The guy pulled it out for me (while hitting against other engines), so I looked it over and took like elleventy billion pics.
Not thrilled about the engine, tbh, but I'll post a thread with pics when I get home.