[quote=jughed]Going by your specs and what's on the list, your block has to be P5007624. I bought an all new 540 shortblock from someone who had it built for truck pull. Thankfully, he saved the paperwork that came with the block.

If you look at the description under the part numbers Jughead posted it says the siamese blocks have Mopar in large letters cast in the block. Both the P5007624 and P5007625 are the same block but one is bored to 4.19 and the other out to the max bore of 4.50.
I have a 2468330 M hemi block that is a 4.31 max bore water jacket block and it doesn't have the Mopar cast above the numbers.

Hope this helps, Mike