I stood next to him and I believe he is about 5'8". I saw him in his prime and he actually looked small in his track suit. I'm guessing 205LBS. When he was on stage he was the clear winner. The detail was unreal.
His book The Black Prince is actually a really good book for a bodybuilding fan. I was surprised it wasn't garbage. It was a well done biography. When I ordered the book my wallet and credit card was upstairs so I asked my wife for her card. When I got the book it was autographed by him saying, "Muscles are sexy Valerie."
He is just a freak in that even back in the day they would say he was never out of shape. No off season bad pictures exist. He just loved to train. He claimed he competed a lot of small shows back in Florida and he didn't use steroids until he came to California.