Roller cams, Velasco cranks, Aviaid dry sumps, Carb Shop carbs, T&D Rockers, $700 aluminum valve covers, Crower rods, - these are the kind of things that make it even more expensive.......
Sure you do NOT need them for a street engine - but then again you don't need a Cobra to get around either -
Mike is on the money at the mid teens .........