The Giant line in that glory year of 1956 boasted of the “1000 pound line”, with each one averaging 250 lbs.
They wouldn’t even make the team now with the 350 lb freaks in their dreadlocks that we see today.
Even in the ‘60s, the average offensive lineman was around 250 pounds. Today’s outside linebackers and defensive ends are bigger than that.
Today offensive linemen average well over 300 pounds.