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Having worked on many single cylinder motors where the intake ports are on the top of the cylinder and the exhaust is on the bottom, it is pretty much universal that the pins go in with the open end down. Yeah, so they don’t collect a gob of fuel. That’s why they caught my eye. But as for motors where the ports are on the sides, I really can’t say with expertise, or even if it makes a difference.
What is universal, is oil holes are on top of the rods so oil goes in by gravity.
Again, opposed twins are not my field. Salt water had killed most of them around here by the time I started my career. At least killed them dead enough that nobody wanted to pay the bill to rebuild them. But things are different now that they are antiques.