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Ed,
Near as I can tell, it's a 1979. As of 1980, Johnson/Evinrude used two LETTERS at the end of the model number to designate the year. (See attached) Your model number ends in a number and letter (1A) which leads me to believe it's earlier than 1980. Prior to 1980, the last two numbers of the serial number were the year. That's how I surmised yours is a 1979, by the last two of the serial. G02651879
Depending on the year model you may be able to adjust the mixture leaner for higher altitude. That adjustment was traditionally out of the very top of the carb pointing straight at you. Screw it in(gently- it's not a wood screw). Then out 1/2 turn at altitude.
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