You won't find much power doing that; even if you were to match it up with a 65mm or 70mm throttle body. UNLESS you were to also use a power adder that could take advantage of the ability to breath more.
In the meantime, you'll notice throttle response change drastically! If you trawl long enough, you'll see Turbo Tom going medieval saying he's tested that on a dyno and yielded no HP/TQ gains. I have a Zetec with an FC 65mm TB and an intake manifold that was dremelled to match up to the TB... that's how I know the differences!