No "Hawk 575" decals present on engines. Only the Hawk World Champion Supercharged stickers on the flame arrestors. The valve covers just have the Hawk emblem on them.
Really I am speaking of what I was told from the previous owner. I was looking at old original dyno sheets from Hawk Marine at Fort Apache, reported 576 HP @ 5200 with the B&M 250s. This may have been an upgrade "one-off" built at Hawk that was arranged by the owner, I can't really speak on that one.