500 hp 360 ??

I had Brian from IMM engines build me a 360 the hard way with a LW 3.580 Scat crank in a 340 block- I have Ross flat tops 10.7 to 1 comprssion W2 heads mild port work, 591/595 soild roller with a M-1 intake and 830 cfm Holley
it made 485 hp @6300 rpms and 440 trq @ 5500 rpms

I would agree sound like 375-400 HP build