1975 Honda XL125 Compression and cam problem?

I have a 1975 Honda XL125 and I accidentally ran it without oil because I was far from the house and didn't check. I replaced the piston rings and got a new cam sprocket. It has barely any compression and I was wondering if it could be my gaskets on the engine. The gaskets are old and need to be replaced but I want to lay it off for a while unless it is the problem. I also am not sure which markings i need to line the cam sprocket up with on the flywheel. Any ideas about what might be the problem?

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