Doesn't matter what size sbc you build, if you want 1,000 horse plan on buying a billet crank, billet rods, small base circle roller cam, CNC ported aluminum heads, expensive forged pistons, quality studs and hardware all the way through, probably a dry sump oiling system, etc. If you have really good buying power, might get most of the parts for around $15,000...... Then when it's all done build a spare just like it because these 1000 hp engines are right on the edge and don't live very long........ What kind of drag racing are you going to do????