I just looked at my NOS louvers and they are both 3927442 and DO have the curvature. I have 2 Nova bezels that have a GM part # 3927443 and appear flat. Not positive if they are original or repro. My originals are on the hood and I didn't remove them to check.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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