One thing to consider is that in NY, NJ and CA cars that are 25 model years old or older are not subject to emmissions testing.
A 80's GT5 will be.
They are grey market cars, probably driven in from Canada. They have nothing that complies with US law. How are you going to put cats, air pumps and the likes on the car? You will never get it through the emissions test. That will never happen.
You may be better off with a converted early car just for that reason.
Also it sounds like they may in fact be better structurally then the 80's cars as well.
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