I wish I knew the facts, but it is my impression that there are far more SBF Cobras around than BB Cobras. The Roush SB 427 uses a Dart racing block, not a stroked Windsor block. My Roush #460 consumes some
oil but not excessively and I have 11K miles. Ask Keith how much to build a Dart block 427 if you want an equivalent price. The Roush engines are expensive no question.