General questions (scoops, stripes, etc...)

There was a hood scoop option for early 70's Dusters. Looks like 70 Challenger T/A scoop. Can't go wrong there.

The 68 Hemi-style scoop was developed for the 68 Hemi A-bodies. (The WRX is a shrunken version) One problem of the Hemi scoops that they found soon enough was the force the wind created at speed pulled up on the scoop and created problems. I don't know if any actually flew off cars at speed but that's why you'll see up to 5 vertical reinforcement bars in the scoop opening. It also adds drag.

Whatever you do, do NOT bond your scoop to the hood. The joint will eventually crack and ruin your paint job. Use a separate bolt-on scoop.