I think what he was saying is the reason it is called a DZ 302 is because it has the DZ suffix on the pad.
I think this car was recently discussed here.
To answer the carb question, if you really want the original 4053 Holley, you are much better off spending a bit more and getting the correct dated carb. That said, if you are planning to keep the car and it runs well than I would not be in a big hurry.
Jason
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