So I installed the oil pressure gauge in the glove box, because I don't want to look it all the time. As you can see it takes a moment and then has pretty good oil pressure?! I drove around a bit and it dropped to 40 when idling in D and went up to about 65 when driving a bit faster.
So there's just no oil pressure in the beginning as the oil light had already indicated. Tomorrow I'm supposed to get the lifters delivered, but it'll probably take until Thanksgiving until I can pull the intake and install the lifters.