[Smokey]

The simple answer is, you may very well have cratered your crank.... especially by continuing to drive after the rattle started.

You didn't tell us what the oil pressure gauge was reading during and after this adventure... It is unlikely, but possible that the oil pump chose that moment to go out, or the oil pickup fell off, or....

So yeah, get it apart to see what's up.

 

[Smokey]

You took the wrong side apart doodoo.... the rods and mains are in the oil pan, not the rocker covers

And, you can't really see the "lobes" (cam lobes) by removing the rocker covers...

Don't try to bullshit a bullshitter....

And, on that note, I'd be surprised as hell if a rod bearing "reseated"; musta been something else banging.