My Stallion clone was a 250 I-6 with factory power brakes, so I did take some photos before I sold the car. The line ran across the engine with quite a few different bends along the route.
I have power brakes with the factory lines on my orange V-8 car and on my blue 250-6 car. If I can help with pictures....let me know.
Yeah on these cars you really don't need power brakes, the manual brakes stop just fine with verry little effort.
Power is nice to have though (if your cam allows the engine to produce enough vacuum), and if you have 4-wheel disc brakes, the pedal effort will be much greater without power assist.
I think I am ultimately going that route. Non-power discs. on the front. It is a light car, so it should work fine. Honestly, I did not think you could even get a power booster in there , just looking at the room under the hood.