Vernon:
first of all unless someone was a great welder you should be able to tell by all the brackets. i can find no where that a 80 rearend will bolt up under your car.
i don't have 64 info in any of my books but i do know 64-67 chevelle rearend will bolt under your car. 68-72 will too but the are a different width. are you sure the 80 is for 1980 and not some production factory code marking?  Here is a link to 64 rareness.
Rear Axle Assembly 1964 Chevelle
                                                                        Larry (z)

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