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i saw some where there is a guy who makes custom sending unit 65 dart
I would drill a new one out and weld or solder in new tubes with the sending unit parts removed. That or weld AN -6 bungs or bulkheads. Not sure if two bulkhead fittings would fit in that space with the sending unit connection.
I silver soldered a 3/8's" return fitting onto my replacement unit that had a 1/4" return nipple.
How did you do that without cooking the wire entry? I did mine rather "redneck" but I "effed up" I put in a 1/4" istead of larger. At the time this was for vapor return Punch don't drill a hole in the drained tank. Use a taperd awl and swedge/ enlarge the hole. This creates lips on the hole to reinforce Fill it full of nitrogen/ CO2 through the vent or fuel line ......And braze it in.........
I had the unit out of the car, used a step drill to carefully enlarge the 1/4" return hole ( used small micro torch to heat and remove original 1/4" fitting) until my 3/8 steel tube fit tightly and used 2 small pairs of vice grip plyers to act as heat sinks while I silver soldered the tube in place. The wired bulkhead was added after the tube was soldered in place. I sourced that from Radium Engineering, but there are other sources too.