did a valve cover job 2000 passat v6. why is oil shooting out?

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i had a 00' vw passat dropped off to me several months ago by a friend to be fixed. he over heated it by mixing the orange and green together ,which seized water pump. he asked me to do full basic maintance. i pulled valve covers and all the vent holes in the topof covers were plugged solid. I soaked them in kerosene scrubbed the debris out rinsed and let dry a few days in the sun. I also soaked oil cap . he calls today and says oils shooting all over the place when it wasn't pre over haul. I drove the car 35 min prior day to deliver so im stummped. where do i begin looking ?