Notice the size of Park's head, which can usually give a idea of the over all bone bone size and thickness. Large even compared to his muscle mass development, so the potential for adding much more mass is suggested. I would think his wrist and ankle measurement would be extra thick. The deeper rib box (not too many modern Pro's have that) give another advantage to his body. When present Pro style chemical engineering is used, wonder what he could have achieved today.
In any event, he seems to give a picture of raw power. I would guess a lot of present day BB'ers would prefer Park's type of build than most of the cartoon characters with the Pro cards now. Seems to be great balance to his body, muscle groups blend together very well.
Looking at present pic's of Arnold, am really surprise by his very average shoulder width. Considering his outstanding breath and delt mass of the pass. Again, another BB'er who's head seems larger than normal.