Have a 1990 Mazda b2200 with a rear main oil seal leak and ticking in the head? on 1990 Mazda B2200

Truck was running fine tell I redid all the front gaskets than developed a tick in the head had it running with the valve cover off to see what was going on and head is only reciving oil in the rear of the head and not the front any suggestions?

Asked by for the 1990 Mazda B2200
poss plugged oil galleys
How wld I unplug tht? Or how much wld it cost to take it to a shop?
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Did you change the oil filter?