This looks about 50/50 on the cosworth daily topic, I think you can easy run one everyday just weekly checks and have a mechanical mind that isnt worried about geting dirty under the bonnet on a saturday.
Lets face it if you do buy a cosworth its for the Bug and that feel you dont get with modern stuff, for me its a piece of history that Ive wanted since I was about 10 I just hope it lives up to it lol.