You are going to need to think carefully about the fuel regulator since you are planning to run carbs and then switch to EFI. You can buy a fuel regulator which comes with two springs so you can switch it from being a low pressure regulator to a high pressure regulator but they are expensive. You can also just buy a carb regulator now and then replace it with an EFI regulator. Same thing with your fuel lines. For EFI you only need a single 5/16 pressure line. Put the regulator and the pump inside the tank and then run a single pressure line up to the throttle bodies. But that doesn't work so well for carbs. With carbs you typically want the regulator up front and fairly large lines since the fuel only has low pressure on it.

In short, EFI is plumbed differently than a carb so you either need to do the job twice, or you need to accept some compromises.