Fuel system question

[Sideways]

I am helping a car friend out and they want to take there current tank out and swap in a fuel cell. This is how they want to do it:


On the right is the "stock" style unit, they just want to bypass that stock style setup pretty much only using the hanger for the in-tank pump.

I see no concerns about it, only thing that is changing are the lines. Using -6 AN instead of the 5/16 return and 3/8 feed. The vent tube will be routed accordingly.