I reckon it would be possible, but imagine how bad tempered it would be in traffic! It would have to be stroked, huge compression, huge cam, extensive dyno tuning, and so much more. You would also have to find a reputable engine builder that can actually extract that much from a n/a v6 aswell. Then once you have the 200rwkw motor you'll need a good box behind it. I honestly think you would use the $8000 in parts alone mate, if not more.
I'm not trying to sound like a know it all, please forgive me if i am, but to give you an idea of the money aspect of engine building, Street Commodores Project V6 Vengeance total cost was $20,000 and it didn't even break into a 10 sec pass by the time the project was finished, and that was boosted. I think the total cost in N/A form was about $13000 and it ran a best of 13.9 or there abouts (anyone know exactly what it ran in n/a form?).
But having said all that go for it and see what you can do with it, you might be suprised with what you end up with. I reckon even 175 rwkw would be a hell of a lot of fun!
Good luck with it mate.
Matt.