Nice to see the cost is alot less now.
I went through two different fuel systems. The first was a sumped stock tank with external pump, but it was a bit loud and cluttered up the bottom of the car with the pre-filter, pump, and post filter. In 2015 I got the "Spectra Premium (CR9CFI) EFI fuel tank with internal pump. It is alot cleaner install, and quieter. The Outlet and return are standard looking barbed type connector tubes (not threaded or AN type connections.) At the time Tanks Inc was not selling the B-Body fuel tanks (they were in development though.) My Spectra tank fuel connection sizes are 3/8 supply, 5/16 return.
Because I had previously plumber the system with the Edelbrock/Russell braided fuel line, I just used -6 AN to 3/8 barbed and -6 AN to 8mm barbed fittings, and used EFI type fuel line with EFI style hose clamps to connect the AN hose to the fuel tanks fittings.
I plan to clean this up in the future, using reproduction stainless fuel lines 3/8 supply and 5/16" return that follow the stock fuel line routing. Then I will cut, bend and adapt the engine compartment ends of the hard fuel lines to convert to the braided -6 AN hose going to the EFI Fuel rails.
I have my fuel rails setup with the fuel inlet at the rear passenger side, and the regulator/return on the rear drivers side. As I recall, the hose fittings I used were 45-degree swivel type.
Additional Note. Flush the fuel lines before connecting to fuel rail. I used a -6 AN to -6 AN bullet (cheap) filter to loop the supply and return lines to flush the lines before connecting. Just ran 12 volts to fuel pump and let fuel flush through lines for a few minutes. After, I checked the screen filter in the cheap (non EFI type) filter and did find a small bit if hose line rubber.
https://www.summitracing.com/parts/sum-230102
On the Charger (340 LPM pump, and might use E-85), I am using the K&N 81-1000 fuel filter (25 um stainless mesh)
https://www.summitracing.com/parts/knn-81-1000
On the Coronet (250 LPM pump, pump gas), I am using the stock replacement type filter (cellulous filter material, I think 10 um?) from K&N, PF-1000
https://www.summitracing.com/parts/knn-pf-1000
With the stock type filter you need the -6 AN to (I think 14mm O-Ring) adaptor fittings. I think this is the adaptor for the filter.
https://www.summitracing.com/parts/rus-648070