Mark won't mention it here, but over in the classifieds is a topic on the engine kits that are being offered by McMark/Jake.
I'm not in the market for an engine, having just finished my own build, but after all the discussion here about what you could do for $5,000 I think this deserves more visibility. As you'll see from my comments in that topic, if I were doing my engine again I'd be all over this instead of doing my own engineering.
P.S. - Someone said they were going to mention this in the Garage, but I couldn't seem to find it. Since I just stumbled upon this through a link in Mark's signature, I figured I'd put it in the Garage myself.