GM and Ford did this electric fuel pump thang in very different ways.
The VB Opel Commodore/Senator/Monza's used A Bosch fuel injection system from 1978. Same wheel base and dimensions as the Fox cars.To the 1/8 of an inch.
Holden in Australia avoided EFi till 1985. All GM stuff used a "stillage pot" to avoid fuel surge, and scavange down to the last ounce of gas. The downside was increased fuel pump failure.
Ford used no stiilage pot, just the "Fly-tongue" fuel pickup and a rudimentary high sided baffle.
Fords rationale was that the tank could be shaped to do the same job as a plastic stillage pot insert/ Ford were only partly successful.
For High and Low pumps above the normal CFi 165 hp range, they work great.
The multiple stage single pumps from 1986 onwards were good too, but when upgraded to say, the Walbro 255 gallon per hour, the return-line has to be nicely submerged.
If you have any problems, have a look at this.
Good fortune.
How you go about it is up to you. but Basin Performance and
https://www.youtube.com/watch?v=Ium8jf4Jm04
https://youtu.be/Ium8jf4Jm04
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