They will just be decoration on mine, with a drain hole to let water out. I am not trying to build a perfect clone, not even close. This car has been totaled twice, and with used parts and time fixed. But has just a couple bubbles of rust in each door, floors are great never rusted, one replaced quarter, non-original 302. The car runs and drives great so just decided to have some fun. If all goes well I'll have less than $10,000 with new paint, interior, Shelby parts, and Air conditioning. Plus some traded parts and time.
The rubber ducts inside the scoops given their diameter and location were more like decoration on the genuine cars too.