Good info, thanks.
My old engine still runs amazingly well, it puffs a nice cloud on startup and it uses oil but nothing insane. I'm not looking to replace it NOW, but I'm starting to think about it, do my homework so I know the way I want to go. It already has a brand new clutch and a newer used tranny in it, that's kind of why I've decided to go a new motor when the times comes and just live with keeping it.
Good to know about the Jasper etc rebuilds, I looked at their webpage.