Thanks fellas for your input. I have checked the mortec site and others but the info between the sites is some what conflicting in what they tell you. I can't find any reference to the block stamping, TO6067BJ, particularly the suffix BJ. I know what the T and the 0606 is but the last 3 digits have still got me baffled. I would still like to get some clues on the number if anyone can help. At the end of the day, as it is a sweet running complete engine, I will probably grab it, especially considering the 512 block. If I decide to change the heads and cam I might just get in touch with you Pat, if that's OK.