[VFB] Need help

[Bills]

I was wondering if anyone can help me out..I have a SA 8-9 spey line that ihave out grown and need to add more belly to it and i am looking for someone the give me advise on adding another 60 feet of belly to it..I have another line that i want to cut and add to but i don't want a loop in it does anyone know how to splice them without a loop?   Bill S Olympia Washington