I have been looking at purchasing a new 8hp outboard to power my aluminium car topper. I have come across and old guy who has had a late 1986 motor since new and has NEVER used it. It is a short shaft with the shifter on the tiller. The motor has been wrapped in bubble wrap and has been filled with oil. What I would like to know is what should I look out for on a motor that has been sitting for nearly 20 years and has much changed from this model to the current model? Are many parts interchangeable?