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I have a parts box here with a FA69 in it, but with a block with reed valves and 3rd ports. I did not think these FAs appeared until the late 70s???

The 3rd bike, closet to the wall, is facing the other way, and u are looking at the rear swing arm.
But this 'flat four' motor was/is popular in side car racing, where the Earles type fork is...