Heads...Joe says 1982 is the good one. Is it all 31.8 1982 heads or just 35hp? Why just 1982-What happened in 1983?

Joe/mike/anyone? have you made a chart with the part numbers and differences over the years for the 31.8 OMCs? I saw one for the 49.7 OMCs and wanted to make a similar one for the 31.8. I started one somewhere.