If It was mine I would use it. Fact is I still buy 400 blocks when I find a good one that is a straight casting. I also buy 400 factory crankshafts if in good shape and are cheap enough. Why? most of my SB customers just will not buy an aftermarket block. WE do a lot of prep on them and have really had good sucess at lower than 700 hp with them. We did have one that at a shade above 800 experienced the main caps moving around. Actually we saw some funny things with oil pressures so tore it down and found the main caps were moving on the block. So now I tell my guys to keep them below 750 hp even with nitrous.
Several of the factory blocks doing 530 to 570 hp in street use in poor boy strokers.
I am not arguing with Carl or disagreeing. He is correct.
Ed