i have a 85 Montauk...It has a 70 hp Johnson that is showing its age.I want to re power to a 90 or 100 hp but do not want to buy new.I am looking for a motor i can rebuild myself from pretty much bottom up.I do have the nohow and the tools to do all but the machine work.My question is this! Is there a model and year that would be my best candidate for a rebuild ( 2 strokes only)???Thanks for any input......Gordy