Sorry, I don't know the answer to your question about the 60Hz pulley and sped adjustment as I have never played with a 401. I do own a 301, but it is not in use because I still need to buy or build a plinth for it. I am currently too happy with my Lenco to worry about a plinth for the 301. But this is the reason I urged you to go to a Garrard specialty website. You will get all the guidance you need from those guys.
Re your remarks about 401 v 301, I'm pretty sure I've read on the web that the bearing/spindle/platter for at least the late 301 is identical to that of a 401, so, barring differences between the motors (minimal if any at all) and chassis' (possibly the 301 chassis is stiffer and better damped due to thicker metal), there should be very little difference in sonics between the two. The 301 has more of a cult status and so commands higher prices and more adulation, I guess.