a friend of a friend of mine in calgary dropped an edelbrock 350 crate engine in an 84 fiero... low 11's in the quarter mile with nothing else done to it, he didn't even have any exhaust hooked up to the manifold hah..
I say the focus zx3 5L conversion.. but I guess the miata and the focus might be a lil more expensive than that audi.. maybe it's just me but it's kind of a disgrace to the audi putting a ford engine in it