How to ID a real MP 360 crate magnum, id the HP rating, and what's it worth?

The 300hp version was a factory Magnum longblock including the cam. I bought a test mule from MP years ago that was a 300hp short block with W2s, a modified factory iron 4bbl, and a 2bbl adaptor…lol. They said the 300hp versions were literally pulled from the production inventory. The 380 was a bit different and “touched” to a greater level.
Getting a 360 fully checked and machined and buying the parts will cost you every bit of $4k with you having a core and you assembling it. I’ve done 1 and almost done a 2nd in the last 8 months and that’s what they cost. So if you worry about quality figure your price based on gaskets to test it down and verify.