I am surprised a 1956 Bridegport has a square ram. For some reason I thought the round ram was made up into the 1960's.
That Bp is only 1,000 more then a new mill/drill. The vise and collet set is worth a few hundred dollars by themselves.
The bare base of the BP weighs about 600 pounds which is the weight of the entire mill/drill. All the main bits that come off are about 200 pounds each. So a Bp is triple the weight to soak up vibrations