While the PAL image will run faster, PAL audio can be pitch-corrected to sound normal. The case with MYA's FOUR FLIES was that the audio was taken from the German DVD which had pitch-corrected the audio and MYA slowed it down without re-correcting the pitch.
I'm not always able to tell if a PAL DVD's audio has been pitch corrected or not if I've never seen it in any other form (or had a soundtrack to listen to) but one that I definitely noticed it on was Cecchi Gori's disc of THE CHURCH where the voices on the English track sounded really high (since I had seen the film on tape originally and had the Anchor Bay disc to compare).
Japanese DVD - NTSC (29.970) 1h 22min 11secs
Fandub - NTSC (29.970) 1h 30m 43secs
Running time for the UK VHS is 1h 27m 20secs (PAL)
The difference between the UK VHS and the fandub can be mostly accounted for with PAL speedup (though when I did my version of the fandub, I was always adjusting the audio back and forth by milliseconds so Italian and English sources differed slightly with both featuring scenes or shots that ran a few frames or seconds longer or shorter). If we were to convert the NTSC speed of the fandub to PAL, it would run at 87 minutes so it would only be 4 minutes and 49 seconds longer than the Japanese disc.