65 Dart gas tank leak

So I'm contemplating replacing the pickup in the tank for several reasons but most of the ones I've found have a return line port on the pickup. Being that I'm running an electric pump, should I run a return line off that pump? This project has been a real pain.i fixed the leak but the pickup is loose as hell and the sending unit is shot. Anyone know a good source for these? Believe its a 3/8 pickup because its a V8 but the ones I've found say 63-76 which I find hard to believe they are all the same. Any input would be appreciated. Thanks guys