if the gasket is put on wrong for the rocker cover, it's the two areas at the front where it goes over the cam shaft that they tend to leak from. the leak tends to drip down, run to the back and drip down, not hit anything else on the passenger side so it can be worse than it looks. drivers side hits the exhaust so you see smoke.
If you overfill slightly, the oil doesnt vent anywhere. you just get slightly higher than normal oil pressure. I did this once by accident and it resulted in my rocker covers leaking. if you overfill, I guess whichever seal on your engine which is the weakest will leak as mine did. Sounds like your crank gasket was the weakest if thats what is leaking
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