I just recently bought a '46 unisaw myself. I had it dismantled and packed into the back of my forester by myself in less than a half hour. A saw of that vintage will need to be torn down for cleaning and refresh anyways, no harm at all in doing it before transport.
Also, if youre not going to remove the motor its best to transport a Unisaw upside down. There are plenty of reports of broken castings from folks who didnt.