OK, I contacted the engine owner.
He said that the pistons were near zero deck, and not above the deck. Also said there was some material removed from the block deck. So, that would make me think that the cast 455 Olds pistons fit just fine.
Now, since the L2323F forged pistons have a .010 larger pin height, that will raise the piston top .010 higher. But, they still should work, unless the block deck has been cut down a lot. From what I've read, if they are above the deck .005, it don't hurt a thing. Lots of engines have been built with pistons above the deck.
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