No reason to go and ripped it apart.. Unless your ready to rebuild it now.
Looking at the parts you mentioned will not tell you a single thing. You can't see the rings no way.
Valve or pistons hitting a head is very rare in a stock engine (cam is too low of lift and the deck height is too high and head gaskets is too thick) The only time on a stock engine the valve will hit is if the valve stem breas or a valve spring breaks. If a piston is hitting the head then the rod or rod bolts are broke and its knocking like crazy and not running worth a darn
1 qt. of oil per 1,000 miles is alot ore than I would like to see but sounds about norm for a well used engine with 150K miles on it
Before ripping into it, try a couple of test to help you pin point the prob, so your noting taking stuff off and saying umm that looks ok.
Do a dry compression test on all 8 cyl
Do a wet compression test on all 8
Do a leak down test on all 8
This will tell you if your head gaskets, rings, valve seats, etc are work/leaking and which one it is.