disc brakes

I am wanting to change the drum brakes on my 67 satellite. Someone mentioned early valarie or aspen. My question is how much would I need to change, the a arm, spindle, control arm or spindle?

I am wanting to change the drum brakes on my 67 satellite. Someone mentioned early valarie or aspen. My question is how much would I need to change, the a arm, spindle, control arm or just spindle?

sorry for reposting didn't notice someone asking just before me.