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I discussed the Holley Sniper type in-tank fuel pump with Peter for a 427 build. He noted you would certainly need to modify the tank in a 289 because there is virtually no clearance between the top of the tank and the body. The clearance to the trunk floor in the 427 was a lesser issue.
I concluded you could have a recess welded into the top of the tank to install the Holley fuel pump and thus get the needed clearance. It needs roughly 1.25" inches (if mounted on a flat surface it sticks up that much). It should be an easy job for a good welder.
Most late model cars no longer use return lines and Holley offers several in-tank units that are near OEM quality and don't need it.
John
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