The top SS Hemi engines are making more than 900 HP. They actually are slightly larger due to overbore, but are still 438-440 CID. I think a 426 Hemi with newer heads like a Millenium head and all the tricks and no port limitations and bigger carbs could get up to around 1000 HP, but that would be a guess on my part. I was told a CW Hemi engine runs upward of $75k, so that's well out of my price range (about 3X).