If only you knew what your talking about. I can get 265 hp out of a 273 with 2 barrel pistons, 920 heads, and an itty bitty Isky E-4 cam. Everything else is stock rebuilt. Just to let you know that is only 10 hp less than the 340's advertised hp. I can and have built 318's that make the same hp as a similar 340 build. A 340 block is a little stronger than a 318, but that only matters at higher hp numbers than most run.