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I think your wasting your time if you think guide seal are bad. I want anyone on the barn that reads this if thay have ever removed the intake valve guides from an old engine (whitch come out hard enough even with correct tool) and found the that guide seal broken or gone or anything. Those guides don't move once there in there and usually stuck to block pretty hard. If anything is worn it's the valve stem and the guide ID. They would have to be replaced. My money is just worn out rings or the breather pipe system is plugged up. You probably have decent compression because the oil is sealing the rings for a compression test. THis not like an overheads valve engine where if the valve seals or worn out the oil be sucked into the cyl. Walt