LA 360 piston ID

I guess that's one way to get some quench out of an open chamber... It looks like someone took some stock bore forged 340 pistons and milled about .050 off the tops, but that would have a stock bore size of 4.04. I would put in a stock oversize piston and rod to see where it comes in at to get some idea of how much may have been taken off the decks. Can you get a picture of the piston from across the deck towards the valley so whe can see what the deck height looks like from the side? It looks like that the outside edge at the spark plug has been relieved to even it out with the deck, possibly for plug clearance.