They took what was avialiable at the time.... My guess is that Arnold took Lots of Dbol and Test when he was in Europe in his younger days... His body type in his earlier pics would seem to back that up.... massive but too bloated to be chisled... He says in one of his books that he came to America for better drugs.... not just drugs but it's listed in a list of other reasons.... I'd say he was exposed to Primo, Winstrol, Tren... possibly masteron... I would guess that he would only use human drugs... These drugs are non bloat drugs that coupled with Arnolds drive, diet and genetics, created arguably the "Best Body" ever.
Zane I don't know I haven't studied him as much as I have Arnold... I would guess that his Drug choices were much like Arnolds but I am willing to bet he didn't go nearly as high on dosage... Especially when Arnold was in his prime... 74 ..... Are you kidding me??? That was the definition of FREAK!!! I could only imagine what his cycle was like that year