And you can see that 2nd plug (the one in FRONT of the distributor shaft) with a mirror through the distributor hole. Yeah, that is a BIG one to leave out... you have a 'hole' in the oil delivery system!
OK on the hyd roller cam; you may be perfectly safe with that being the case. Examine the lobes and rollers before putting back in. I'd look for any signs of heated metal or scraping marks or anything like that.
Are you gonna replace the rings? I would certainly look hard at doing that. I suspect they will never seat in now; the surfaces may be hardened up. New rings would require a light fresh hone in the bores. No point in messing around on the ring seal, IMHO.
