The surface units and the oven elements are hard wired. GE found that less troublesome than plug in units. There is no reason to prefer one over the other except that with hard wired elements, you don't have troubles with the contacts and receptacles arcing or shorting. The bake unit in the oven would be a Tilt-Lock type so that it can be lifted for cleaning and will stay up off the oven floor, out of the way.
If the Automatic Calrod was converted to an infinite switch, so much the better. It gives you some flexibility for the rare times when you need a "between heats" heat like with some pressure cookers and fewer chances for problems.
There is no reason to be worried about the quality of this range. GE was a little lean on oven insulation, but the performance and durability of this range would be very hard to beat. It has been gently used and well cared for.