[storm9c1]

Original '70 would have came with a short water pump. Which also means different alignment for the PS pulley. If you keep the long water pump, then you need a PS pump and pulley for a long water pump setup.

Is the crank pulley for short or long water pump?

If it's for short water pump, then you will also need to change your water pump. Or get the correct crank pulleys for a long setup. The original crank pulleys for a short water pump would be stacked, meaning the PS crank pulley is a separate bolt-on pulley that stacks on to the crank pulley. If I recall correctly.

You aren't the first nor the last to get mixed up with this. There are probably 100 different pulley setups for the SBC spanning decades.

Sometimes it's easier to pull a complete accessory setup off something in a junkyard and replace/rebuild the parts for that year vehicle.