So I slapped my intake manifold back on, smoke tested everything, and it all checked out. Took the car for a ride, still had a minor oil leak despite new AVCS solenoids and access plate gaskets.
So after doing some more research on the interwebs, I got ahold of the O-ring that sits in where the oil filler neck connects to the valve cover. Sure enough, the old O-ring was pretty flat and hard, so I gladly replaced it. Hoping it fixes my minor little leak!