Ro,
I was in the same boat as you about 3 years ago when I started the restoration of my GT/CS. Originally I wanted to stay with the original specs and bought a lot of NOS parts. I also paid a lot of money trying to match the original specs on a 289 engine with the correct nuts, bolts, pulleys, brackets, etc. In the end the 289 didn't run very well and also the vacuum advance on the distributor was getting in the way of the AC bracket. Long story short, I removed that engine and built a fairly decent performance engine with the internal components that we hand picked. I am very happy with the decision to add more power, headers, etc. Nothing that can't be removed and go back to stock if we ever need to.
I am still planning on keep the originality of the car and using most of the NOS / original parts that I restored / purchased... Interior would be all stock, paint would have a tad bit of metallic flakes to make it pop..
My recommendation is to go with whatever that makes you happy. And Marty is absolutely right in his assessment.
On the scoop, even the NOS ones might require some rework. At least the one I purchased as an NOS still needed some rework.
Good luck with the restoration.