Power Steering Conversion for a 66 Dart 270

BBEG said
Here's a dumb question... why would I need to modify anything with the crankshaft if the Borgeson kit and bracket just bolt on? Honestly wondering, I'm not much of a gearhead yet.
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Not the crankshaft and the damper, you need a double groove pulley for two belts, waterpump/ alternator and a additional groove for the steering pump.