New "oem shortblock" probable spun bearing with less then 10 miles on the motor :/

[92RT-TT]

I bought a project car from a member on w3si. He said it had a new oem shortblock. Cool I'm thinking, so I finish putting the FMIC on it and fire it up. I go to drive it down the block a few times, everything is sounding great, check the oil, coolant. Everything looks good. So I decide to drive down the road a bit further and keep in mind this whole time I never went over 3500 rpm and I was running wastegate boost. I was also logging for knock.

I go down the road about 3 miles and turn around. On the way back I'm going about 45. Zero knock the whole time, just cruising at 2k rpm, and I notice the oil pressure is extremely low, next thing I know i start hearing a knocking noise so I drop it down to an idle and coast home.

UPDATE:
Looked at all the bearings and all of them are good. In fact they look new, which I would expect with only 40 miles on the motor. I'm thinking it could have been a lifter so I'll be looking into that this weekend.