I wouldn't bother with trying to get 400 out of a CVH. to be honest, and I know i'm liable to get abuse for this but the CVH never really was a great engine in my opinion, i'd prefer to go down the zetec turbo route to achieve that, or YB cossie running gear. Think you would want 4 wheel drive for that, or at least rear wheel drive, like the post above says, you would struggle to get the power down.