As I said in my earlier posting, I do not believe the hole you’re using for this assembly is stock. The only large hole should be the one used by the sending unit (and fuel pickup on most Pantera’s). There is another hole at the high point of the tank, for the vent and there’s a fitting that’s connected to a pickup tube, that was used on early cars but blocked off on later cars. There’s also the hole for the filler neck. I believe the 3 bolt flange hole you’re using to mount your pick-up assy. has been added at some point in the car’s life.
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