Erik,
Considering guys like Jones, Hogan, Nicklaus, and Palmer have all had their swing speeds calculated at over 120mph and the average swing speed on the PGA tour has increased by ~1 mph in the last 20 years I have little to no believe that the players of today could swing the equipment of 30 years ago dramatically, if any, faster than the players of the time. Especially when speaking of their ability to swing at speed and hit the ball accurately with any level of consistency.
Widely regarded as one of the greatest drivers in the history of the game, Greg Norman had a high swing speed and in the late 80's, early 90's averaged under 280 yards off of the tee.