" Most were only weeks away from being contest ready year round "
I would say 3 months away (-).
One thing people don't realize is the 60'-70' bodybuilders didn't train year round. Three months before a contest they trained very regularly, 6 times per week for some, 2 or 3 hours each session. Here in Europe the right drugs combinaison was (Dianabol + Primo). You could find this quality medical combo in every pharmacy. And you were legally allowed to buy and use them with a prescription. With training and diet, you could gain quality weight and strength very quickly.
The rest of the year, bodybuilders didn't train at all. Some were training but just 2 or 3 times per week, 20 to 40' each session. They didn't take drugs. And they were losing body weight.
In the 80', HGH has been added to the arsenal. This drug marked the beginning of the end.