This is just an extended cold start and idling video of my 1989 Mustang GT with a gen 2 coyote swap. It's a Flowmaster American Thunder exhaust with a custom X-pipe. I was testing the coolant circulation here and everything seemed to be great. Fuel pressure was about 10psi too high though. A couple of revs, one up to 5k rpm at 7:06
Re: the oil at first startup, the valve seals are probably a little leaky, I'm not that worried.