Did you adjust for company size? I bet the average s&p 500 company is much larger than they were in the 60s. Doesn't seem strange or unjust to me that a ceo of a $1 trillion market cap company can demand higher pay than one for a $1 billion company.
If you adjust for company size then you should adjust for inflation as well. I’d be interested in knowing for sure, but if I had to, I’d guess they’re 5-10x, not 1000x, bigger.
One other way to measure it is by worker productivity, which has also increased since the 1960s. Somehow those productivity gains are disproportionately hoovered up by management.