I went through a friend's stash of engines and blocks he has compiled for years. He is in Redford Mi so I would assume most of these came from cars that rusted away decades ago but you never know.
383 assembly WM23H9G141016

340 blocks 3R229179, 0B414575,

340 assembly 0B205271

440 assembly 9B417266, 2C257704 also a J440 I could not get the VIN from

Rick Simpson 905-373-7087