'72 Scamp Can I just fix the front brakes to get it home?

My bad here, I didn't explain myself to well. I've done countless brake jobs on modern cars with power disk brakes, replaced rotors, pads, calipers etc.

I'm just new to manual brakes and drum rotors. What caught my eye is the master cylinder that shares the same resevor. Not sure if having bad rears will effect working fronts.