67/72 c10 half 2wd

[slammeds1002]

few people are helping with converting from manual steering to power. im wondering when i change over.if i need to change pulleys as well. bought the power steering brackets i need changing to long pump instead of short pump was alot cheaper. do i need to change all the pulleys or just crank pulley. using 72-73 box and pump trying to figure out what water pump. the water pump im using now short 327 pump and has the heater core hose out the left side of pump.cant find like that only at top that should be ok to use right HELP!