RE: Welcome to Club SAITO !
I'll try the green scrubby approach... as for ownership of the engine, I already own it. Overall, it was in good shape and I usually change the bearings anyway.
I don't agree with the lean run though. Judging by the buildup of hard caster that I'd found, I think it was run more rich than lean.
I don't have any scrubbies here, but have some at work. I might work on the engine tomorrow on my lunch hour. And, I might also try that anti-freeze trick again. I haven't used it on this engine, but have on others. Found a really small crock pot for $10 in a drug store once, and it's paid off!
Bob