Hi,  I'm new to this forum, just bought a Super 77.  Question is there is no serial number tag.  I'm going to be pulling it farm stock, so I need to know the year.  From what I've read they were built 54-58.  I did find a few numbers on the block.  Right side by steering shaft, close to the right rear motor mount--965960.  Behind starter--1652201B, IM100B, S122454.  Number on head M180C  CWC 185402  G129. Any help will be appreciated.