Flying Scott's do not have a cored hull. There will be no "soft spots" that you would associate with a bad core. You should expect spider cracks but, they can be repaired. They still make Scott's and they have a very large and active fleet. They are stable and forgiving. They are well made and I wouldn't hesitate at taking on a 1973 boat to make her like new. There will be some problems for sure but, there shouldn't be any hidden problems. You're biggest problem would be a seller trying to get big bucks for an old boat.