55 Fuel Tank Question

[usdcrs]

This is my first post here and hope I am not repeating old convos. I have a 1955 Chevrolet pickup that has had the drivetrain from a early 90's full size Chevrolet pickup. They mounted the fuel tank for the donor truck in the bed. I am assuming so they could use the original fuel pump and lines for the throttle body fuel injection. I am looking at putting a 69 Mustang tank under the truck. Is it feasible to cut out the part of the fuel tank I have where the pump mounts and have it welded into the Mustang tank so that everything will work without much modification? I don't know if it matters but the truck is running Dakota digital gauges. Thank you in advance.