Question about what brake lines to order

I have a 67 notch that has had a 74 scamp frontend (frame rails, suspension) with power disc brakes. On the back end I've upgraded to an 8 3/4.

I'm wanting to order the brake line kits since I have a show discount with free shipping from Right Stuff.

So...

Do I order the front brake line kit for a 74 scamp with power brakes?
The front to rear kit for a 108" WB car? Do I get the 1 piece Drum or 2 piece Disc kit?
The 67-69 8 3/4" Flex Pumpkin kit?

Thanks in advance.