Assuming you are going the fuel injection route you have two options.
Save the donors pump & sender unit.
You will then need to fabricate your tank to suit the pump & sender assembly. You will also need to give some thought into building a swirl chamber within your tank.
Use an aftermarket, externaly mounted high pressure pump, filters & external swirl pot.
This being the case you will only need 1 flow & 1 return union on your tank. + any mod needed to fit a sender unit if you want to fit one.