Awesome! That is amazing! You should submit it to Flussigmagazine, it's all about the 924/944/968 and they love to write about stories like this.
Http://Flussigmagazine.com
As an example, here's an article they wrote on my 951S:
behind the forum thread... - f l ü s s i g m a g a z i n e
It wasn't as good a deal as yours, but it's a pretty quick car!
As to your smoking on startup, it sounds like a possible valve stem seal or valve guide problem. Probably something to look into when you do a FOES.