So I may have the opportunity to buy a starcraft with a 50hp mercury. I am told it was made around the early 70's, I have not been to see it to get numbers to see when it was manuf. I'm not familiar with this older model or steering system. The pictures look like it is a cable system of some sort. Looking at the pictures ca you help me with how it operates or what i might do to upgrade the steering system if available.