I took the o-ring cord I have gotten out to the shop today, and it appears they will do the job. The actual 3mm stuff I got from China seems to fit the best sticking up above the milled groove enough such that it will form a decent oil seal. I offered to bring the valve covers back home and put the seals in myself but the tech told me to not worry about it, he will do it.
He also told me he was planning to start putting everything back together again this time next week, so hopefully everything will go smoothly and work like it is supposed to afterwards. I really hope that new clutch works as well as I have read it does. And with any luck the drivetrain noises and problems will be behind me and I can just drive the car without worrying about a strange noise being an early warning of something about to break or fall off leaving me stranded alongside the road.
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