Unless something is worn, the one you have is probably as good as any, unless you have modified the engine. You only need more air if you are making more HP.
The chance that there are NOS parts available is about 0. All of them will be in about the same condition as the one you have. Some people have used a Camaro intake tube to get rid of the resonator on top, not have the hockey puck, but it has a resonator extending down in back of the radiator. Again there are no new ones.
The engine is supposed to make a few more HP with the top resonator in place, but it looks nicer without the resonator.
You can get silicone elbows, and aluminum intake tubing to make your own, and some have used plastic plumbing tubes, although the plastic ones tend to compress with clamp pressure.