Fuel Tank Modification?

[TypeSL2]

I am planning a 6.0 LQ swap in my '63 and am going to be using an under the bed tank relocation kit. I was curious if I am going to have to modify the tank at all or if I can just swap to this new tank and run an external pump later on down the road. I know I have seen some people sump their tank, but I didn't know if that was out of necessity, or if it is just common practice or etc.... My thinking is, swap the tank now and run an external pump later and never have to touch the tank again. Thoughts? Suggestions?

edit: I also do have a fuel pump out of a Trailblazer SS, but I don't know what would be involved in making that pump with with my tank, or if it would even be possible. I got it for my wife's car, but may use it in the truck if it would make things easier down the road.

James