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The 400 small block is actualy it's own design. The cylinder walls are siamesed meaning their joined with no water jackets between them. The blocks are then drilled for steam relief holes on the deck. Heads other than 400's must be drilled to match these steam holes before being mounted. The crank is different with larger main journals as well as being externally balanced at the flywheel and harmonic balancer. The rods as well were differnent with a longer stroke. Cooling was a issue with many of these engines but with a large enough radiator and a high flow water pump these can be overcome. A good rebuild on a 400 with 10.1 pistons and good breathing heads is hard to beat in torque .