When I did my Charger I used the EFI tank from Tanks Inc. sorry I am no help smile , the sending unit hole at the angle it is would be bad with the weight of a pump & no support.

1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5