Might look at an EFI tank (Tanks Inc) if you ever think you might go to that at some point. If you have to buy a tank anyway. Not sure on the interim of running a carb on an in-tank pump, but I am sure there are option.
Can't say it will be cheaper, just something to think about.
A friend and I built my EFI tank using a new tank and a gen5 Camaro fuel pump, but I wouldn't suggest buying a new tank with the plan to do this after running gas in it for awhile.