Ifyou're talking about reproduction parts made in 2010, then you may need to prove that they're replicas of parts made for 1984 or earlier. And you may need to prove that they are "exact replicas" (whatever that means).
But if you can do that, then you're home and hosed.
In reality, there's a lot of grey area that can be exploited if you want to - and if you are prepared to live with all of the possible consequences...
We've also got a funny attitude to repro parts - an improved replica is usually tolerated/admired far more than a slightly later part, even though the later part may be an authentic production replica of an earlier works part...