Break in gone bad... 360

Got my LA360 with J heads on it in and fired up for breakin. Running a new 3 row champion with new water pump. Running basically a 340 cam. 9.4:1. Holley 650 stock out of box to start with. MSD 6AL, new MSD billet mech advance distributor. Had 2 squirrel cage fans in addition to my 20” Mopar 5 blade. It was moving a ton of air. Anyway, it cranked right away and took it to 2000-2300 rpms. Within 1/2 minutes it was at 190, then 200, then 210, took a touch of timing out, didn’t help.... no matter the timing we shut it down as it was nearing 230. 8 minutes in. The last 4 seconds ONLY it was blowing smoke. As in something let go. The pass side manifold and head seemed to have been HOT. It was running very crispy the whole time.
Pulled some plugs and saw what appearing to be a speck of brass. Pulled the engine and a head.... didn’t see a gasket blown. No coolant in the oil. The top 1/2” of the middle cylinder bores has dark brown rings about 1/3 the way around the cylinder where the cylinders are closest. Taking it to my motor guy tomorrow to see what happened. Coolant was topped off at the 190 degree mark then cap installed. Brad Penn Break in oil per the engine builder. What are some opinions on how it ran that hot that quick after startup in 50 degree shop temp? I’ll know more after they pull it.

Also,every single Intake valve guide orange seal was up in the springs. Ughh. Never had any trouble with his stuff. He’s done some race stuff for me for a while. Knows Mopars pretty well too. Actually very well.