Doug, thanks for the advice. I was planning to keep the block as I really want this car to be as original as possible. I was told by the person whom I bought it from (he worked for GM in MI), said there were not many 350HO's made with 4-Speeds as the 3-Speed was more typical. Interior, floors, frame rails and trunk are mint with only the quarters needing to be replaced. He also indicated that it might have the Royal Bobcat package as there are Royal decals on both rear windows.