454 30 over with 2broken pistons due to detonation. Going to replace all of them. Current is Hypertech H581P. 600 lift cam stock heads, GM 427 intake, HEI, Holley 750 VA, headers in a 69, 4 SPD, 3:42 Posi. Should I replace the same ones with new, or any other suggestions. Engine has about 5k miles before the racket. Street car driven very little. Had very good power. Built by PO.