Just want to be sure I understand what you want to do…. You want to use the crank/rods/pistons out of a 1977 model on a crankcase from the 1982 75hp, correct?
The crankcase part numbers are different, but the rods/crank/pistons seem to be the same part numbers…. So, I am not sure that answers your question, or if I understand what you are attempting to swap…D
