Fuel filler neck

I need to know if a 1969 fuel filler neck will work in a 1971 dodge dart swinger. I want to switch to the other vent system and fuel tank. Will there be any modifications? I know the 1969 unit Bolts in from the inside, and the 71 bolts in from the outside. I know I will also have to switch fuel caps. I just need to know if I will have to drill any holes, or any other modifications at all. Thanks in advance for any and all help.

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