I checked the FAQ section before i posted.......I didn't see the question nor the answer.

My question is.......im running new brake lines to the front and rear of the car.....and curious on what size of brake line is it ?

2nd question.......i have new disc brakes up front and normal drums in the rear.....Would you BEND the lines yourself ? or BUY them pre-formed ?

 

mustangs unlimited has line kits preformed

 

Bending the lines are not that hard it really depends on what you want.
The same size as the stock lines would be fine it really comes down to what fittings you will need for the ends and how good you are at flaring.
The size of the lines will just affect the amount of fluid you have to put in and how much you will have to bleed the lines. the preasure will be the same.