Biggest issue with a firebird is the deck is flat, almost 0* slope towards rear, and no center ridge with zero taper to the sides.
A 78-80 regal vs 81-87 olds decklid will face similar challenges, just not to the same extreme. Some alterations to a gasket/spacer between pedestal and metal, or alterations to the pedestal end itself. How much effort that's worth? Meh, only the OP can decide that compared to his abilities.
I had a 79 Cutlass with a 455 olds in it and I was going to put a rear wing on that . If I remember correctly the firebird and hurst wings are a little wide . You might want to check the length . I’m sure there’s a few guys in here that can tell you the length of there wings.
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