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Are you certain the heads didn't get swapped? Happens more often than you'd think and will cause leaks. Second, get a torque wrench and look up not just the torque specs but also the bolt order. There is a pattern that must be followed to tighten the bolts, not following it can warp the heads.
Use compressed air to blow out the oil galleys in the heads, these can get blocked and cause leaks as well as the ones in the block.
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