The bridgeport I need to get going is a very late, metric, vari-speed head... I will buy a cheap huanyuang and head on over the location... It is just for testing the mechanicals of the machine are good for the owner.
I hooked my head up to my vfd a few weeks back and it ran fine. You can run the head on the vari-speed on 50hz or 60hz, over here we are 50hz, but the Americans are on 60hz, so you can use either.