Beautiful Set Dave
Those early 8 vane Power-Fin agitators were actually more gentile on clothing and more effective at turning over big loads.
Unfortunately Maytag quickly cheapened the agitator a year or so later. The newer PFA in addition to loosing the extra four vanes lost the skirt underneath that really made the lint filter really work better by pumping more water through the filter.
The problem with these early PFAs was the two piece construction allowed water to get up and on the agitator shaft and seal area, and as a result the durability of the agitator shaft seal and therefore the transmission was much worse.
MTWs of this time period also had a lot of problems with the cheap O ring oil seal in the bottom of the transmission which caused most of the washers to have a serious oil leak underneath.
Dave your New washer and Dryer were probably very low use, Congratulations on a cool find, but unfortunately just like low use WPs, KMs etc from long ago they won't run many years if you use them much without serious repairs.
John L.