Small block oiling issue

It's possible the cam bearing spun but you'd think it would be squawling becaise it would also shut off the oil supply to that cam journal. Sedann man I'm not positive but I believe it's a straight enough shot through the oil hole in the rocker stand to the cam bearing that you should be able to run a real long drill bit down through the hole to see if maybe some crud plugged up the hole. You could also use a long piece of wire but it won't pull crap back out like a drill bit. And you could also run it down both sides and see if it goes in the same ammount. If it goes less on the one side it might indicate a spun cam bearing.

BTW: the head gaskets have locating dowel pins that prevent installing them wrong. If you try to install the head gasket upside down it won't go on.