a couple of (dumb) brake line questions

[jocko]

So, I'm kinda working this upgrade to power brakes with a dual res master cylinder upgrade in the process (drum/drum) - with lots of help from the good Captain's parts shelf and an idea the ChiefRocka spawned in a thread he did about splitting the brake lines.

Couple questions coming up:

1. For a drum/drum arrangement - what is the proper size brake line for the front and rear reservoir - should they BOTH be 1/4" lines?

2. IF, big if, I decided to upgrade later to a disk/drum setup, I know I would have to replace the line to the rear reservoir with a larger line. What are the correct brake line sizes to the front and rear reservoir for a disk/drum setup?

3. Where does one get them thar fancy a-dapters that allow you to fit the correct size brake line to the master cylinder reservoir? (here's why I ask - I was looking at a 75 imp power disk/drum master cylinder - and a 5/16 line fit the front reservoir and NOTHING apparently fit the rear reservoir - 3/8 looked like the right size, but the fitting would not thread in. Now, I realize that these are too large and I need a reducer - but see question #2 for that... I'm just askin where I might find the adapters and wondering why even any wrong size in standard (even large) brake line sizes would not fit the rear reservoir - seems I'd have a problem finding an adapter that would fit also??)

4. For the current plan - I've got Captain's bracket, a 75 imp booster and a 67 C10 dual res master cylinder. What I am wondering is this - is there a difference between a master cylinder that was intended for use with power vs manual brakes? (When I looked up/ordered the 67 C10 master cylinder for this project, it did not differentiate a master for manual vs power brakes - but I've seen a few threads on here that seemed to imply that that there may be a difference. (But I don't think there is one)).

Thanks for your help - I am still leaning toward just upgrading to power booster with a 6y7 drum/drum master for now, but was considering grabbin a cheapie 75 imp disk/drum master to sit on the shelf if/when I ever do upgrade to disks up front. My assumption is that the drum/drum setup uses 1/4" brake lines all the way around and that a disk/drum uses 1/4" for the front reservoir and 5/16" for the rear - but I just don't know - thus the questions!