Just my $.02.
On another make I had a 715 HP stock block motor, did not know it at the time but the block had core shift. It was only a +.030" over bore. It came apart in a big way around 7,000 few months later. Measuring some of the block after, thrust side of the #1 cylinder was .080", the other was .300+". Basically anything that moved was ruined. Roller cam bent, roller lifters, valves hit pistons, crank bent, even bent snout on ATI balancer.
I will never do another motor without sonic checking. Last one I did was .250" and I still filled it.
having the sonic numbers will help me decide which block I will use, be nice if the second one is as good as the first.
