With the engine 6" behind you and the rest of the build quality, I'm not sure it matters. In a new car, rattles/squeaks drive me nuts. In a Lotus, and I have a 1991, I only listen to see if one of the noises is something bad.
Don't need much if anything. Make sure the plastic rain shield is there and not all ripped up. Be careful adding sound deadener, it adds a lot of weight. If you feel you must put some in use it in strips to prevent "drumming".