If you guys are dreaming of more horsepower, why not go all the way to 512 and be done with the shortblock? If you don't the next step up a couple of years down the road will cost you more than the parts to get to 512 now. BTDT MORE THAN ONCE. If I had gone big when I started my rb block build, I would have a B1 Mc headed, aluminum kb motor making over 1,000 hp for about the same investments it took to make 880 hp.