Wow ,you know who built it ( 8 years ago) If the above is the case, no way that motor was broke in as claimed. Solid lifter would have presented when rotating on the stand. Once the hydraulic ones pumped up...can't imagine the other 3 exhaust didn't suffer. No use pondering on this , once you open it up, you'll discover the mix matching of parts. Sorry man.
Like I posted ,I've wiped pushrods out with no piston or valve damage. Other than the PITA of pulling the engine , may not be a lot of damage to your wallet.
Oh, cut open your oil filter to see what's in there for metal particles. (if the lobes got ground off ,guess where they are at) You know this Darrell, posting for the 100's who happen on this site and don't.