No you don't have to get a new rail. You can modify your rail to accept the aeromotive rail, you just adapters.

I will be going with an aeromotive/wally pump combo, with aeromotive afpr, custom fuel rail and large injectors.

If you are going to do it, do it right. The buschur bolt on would probably be your best choice unless you can find an old school charged air/spoolin up, but that wont happen.