Brake power or non power?

Hello,
My Demon 340 car came with drim brakes all around. The brake master cylinder area was empty when I got the car. If it had drums all around, can I assume it was standard (non-power brakes)? I have upgraded to the LBP front discs and the larger rear drums for 15" wheels. My motor build is a 416 stroker. I was wondering if I should install regular Master cylinder or go with power? I understand vacuum may be an issue for the power? I do have the build sheet for the car and under the brake items it lists the codes front B04, rear B24, drums B11. Power column is blank. So the proportioning valve which is still on the frame rail I take it is a non power drum brake. I did get the proportioning valve with the front disc setup which I bought used. How do I know if that proportioning valve is for power or standard discs with rear drums? I think I like the idea of staying away from power so I can keep things simple and not worry about vacuum plus gain more space in the engine bay?