If you are unsure just take lots of pictures, you will be able to get it out with almost everything still attached anyway, dont worry about the servo on the brakes its not needed for the roadster
If you find by the time you get round to fitting it into your roadster you are stuck a quick photo on here and someone will know where the part in question goes
Just ask TT on here ive never known anyone with as much knowledge on sierras as him
The inlet manifold is on the opposite side to the exhaust manifold and lets the air into the engine