Ray,
No, I don't think AmberT is joking. For quite a while, engines and various parts for them were available from Herkimer Tool&Die direct. I've heard that BRODAK also sells complete OK Cubs, perhaps at least the 049A.
According to "Designman" on another site, and via other discussions with him, the OK Cub engines respond well to a light breathing upon, and have surprisingly nice power for someone that old (over 60 years!!). Not stormers in the class of a well-prepped TeeDee, NorVel or repro Atwood Shriek, but very usable.