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Get the casting numbers off the side of the block, then do an internet search for 426 block casting numbers. You should be able to come up with a list of casting numbers that will tell you what it came out of. If it's from a motorhome it should be fine. I have a 440 out of a motorhome that I'm planning to put in my Belvedere. There may be some differences if it's a marine block, but I don't remember what they are (maybe something to do with the rotating assembly?). But you could still use it in that case as well.