As far as I know, all the squares I recall doing back in the day had the dighram type clutch with all the fingers all the way around. So I'd say it's possible that clutch you have now was an upgraded heavy duty clutch. Nothing with those diaphram type pressure plates. I've always known them to be reliable and long lasting, and whole clutch assembly for that matter so long as you have the flywheel turned so it's smooth and true.
What transmisison do you have? 4 speeid with Granny Low or 4 Speed with Overdrive?
Not sure about 84, but in 87, there was 2 different clutch plate sizes. The 4 speed overdrive trans used the bigger one. That shouldn't matter to anything on a fresh turned flywhee. If it's just a few bucks more, I'd go with the bigger clutch plate.