When looking at statistics for players who may have played a half-century apart it is difficult to compare. Back in the 1970s and into the ’80s, the only time you would get a starter off the mound is with a gurney. The KC Royals were no exception as they had hurlers throwing complete games until their arms fell off.
Another factor to consider is how Royals/Kauffman Stadium has changed over the years. It has always played as a big ballpark that makes it harder to hit home runs but for the first two decades, it was also played on AstroTurf.