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

320 HP Magnum- magnum based motor: dual plane OE copy intake, with R/T heads w/2.02 intake, .385/.401-250/264 roller cam. Sometime after 2002 to at least 2007 MP catalog P/N P5153476
Interesting, Never heard of this version