Don’t see where you posted the CPP MC. They should be able to tell you dimensions. If it’s small it would be good info for everyone. What’s the PN?
Not sure what your question is on the booster. The booster setup is rather unique in these cars and I would keep it if you have it.If you don’t currently have power I would stay with manual brakes. See your service manual for location and type of the power setup, it’s under the dash with a remote vacuum reservoir under the hood. No room for a booster on the MC as is typical with american cars.