Yes Mike, it can be done. You will have to do some modifications to the frame. I've only read about others on this forum dealing with the differences of installing a 4 speed in the 3 speed chassis, no personal experience doing it. A few have restored them back to 3 speed after removing a 4 speed transplant.
I, and many others will encourage you not to do it though. '64 110's aren't super rare, but they are only original once, and older than '65, '66, and '67 RFs.
Try an ad in the classified forum for a good used one, maybe you'll get lucky!
But it's your tractor to do as you please.
tommyhawk
I, and many others will encourage you not to do it though. '64 110's aren't super rare, but they are only original once, and older than '65, '66, and '67 RFs.

Try an ad in the classified forum for a good used one, maybe you'll get lucky!
But it's your tractor to do as you please.
tommyhawk