Tips on making your own transmission lines

I kind of need some help in a DIY transmission line - just a few questions


The car is a Dodge dart - Slant six - automatic transmission 904. I wanted to replace both lines since they were rusted out (broken) and what better way then to just make my own. Reason I want to go this route is because I am going to be putting headers and wouldn't want them to be in the way. I would have them follow the frame of the car so there wouldn't be any interference.


The questions are


  1. is a 5/16 line the right size?
  2. is a bigger line better?
  3. Aluminum line or Steel?
  4. what are the thread sizes of both transmission lines?
  5. Brass or steel inverted flare tube nut?
  6. summit has lots of tube nut sizes/dimensions but im getting lost pretty quickly can some one guide me to the right ones that i need
  7. inverted flare or bubble flare? I think its mostly inverted


Thanks guys for your help again :prayer: