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By Law, ALL aftermarket catalytic converters must clean the gasses and have no mechanical failures for 3 years or 36,000 miles - whichever comes first.
There are others available, some with a 3" inlet/outlet and some with a dual in dual out, great if you are running headers. Some that look like mini torpedoes, for the space challenged.
But that was the going rate for an AM direct fit unit, a universal fit was even cheaper.
I noticed that this one does not have an air tube. I'm pretty sure that your 80 does have one (though these are often rotted away and missing). Be sure that you don't need to be "original" to pass your local regs.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.