I'm no expert, but it sure looks like the IROC tail. It's not the standard 76-77 turbo tail. Notice how far back behind the car it extends.
Ebay car: 
Standard 76 turbo:
IROC: 
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Dean T
1984 Cab White/Blue
Cat bypass, B&B muffler, Steve W. Chip
1966 912 Red/Black
1963 356B --sold--
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