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No LRE trucks were W2's. They wanted to do it but something about california emissions... To make sure it's a 360 block, the numbers are stamped on the driver's side front of the block just below the deck.
I remember a shop that was sonic checking 318 blocks and boring them to 4". Strokers were coming out at 402 inches. Or just get that 360 and build a 408-426" small block. That'd be my advice.

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even easier, there's a big "360" cast into the side of the block behind where the starter would sit.....and the damper will be ~ 1.125" thick...

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It should be an E58 motor and if it is all original, it will have little stickers ( in most cases ) on the front of the valve covers that read "Premium 360".