What is this vehicle?

RustyRatRod said

That's a Buick Opel GT somebody tried to make look like a Corvette. Note the L88 hood. WTF is the Rustang side scoop about though?

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That's what is throwing me too, if it weren't for the mustang side scoops I'd say conversion gt opel absolutely. Even with the rear side windows missing. Its possible like diymirage said, just a mechanic's special. Like a total Franken rod.