68 Barracuda complete brake

My advice, only change what needs to be changed.
Brake fluid - replace it. Over time it absorbs moisture, kindof good and also bad, and looses its anticorrosion buffering - which is just bad. Valvoline DOT 3/4 is has been my favorite.

OE drums in good condition, keep 'em. A little damage, and not at the maximum diamter, have them turned just enough to get a good new surface.

Being that this 2017, and your car is a 1968 take a look at which shoe and hardware are on the car. Then decide what to buy assuming the shoes need replacing.

Its a good idea to use all new springs.

If someone has changed the hardware and shoes to the '69 style, and you're not trying to be 100% correct, then stick with that. The tabbed shoes provide a greater surface area so will reduce wear on the contact points with the backing plate.

If it actually has the correct shoes and hardware for '68, then get those relined or at least hang on to them.

If you're getting real picky, shoes should be arced to the drum. Not many places do this. Rochester Brake and Clutch is one. Another is Porterfield. Rochester may be worth talking with if you want something relined. Porterfield is generally more for racing although I'm using their street R4S lining on my rear shoes as well as the front pads.

When I last was driving and autocrossing a car with all four drums my preference was strongly toward semi-metallic linings. But I didn't know about the specialty places then - and not sure I would have/could have ponied up. My disappointment with the parts store's limited choice (way pre-internet) was hit the junkyard and sometimes I lucked out. So if you're not doing Porterfield or Rochester (or similar), my suggestion is to look at for semi-metalics with the best friction rating you can find. Unfortunately, about the only way to find the friction rating is look at the shoes yourself or contact the manufacture.

You shouldn't need any performance enhancing devices with your cars drums. The duo-servo design helps amplify the braking force. Take your time, look at the pictures and all the tech tips from Chrysler to get everything just so and they will work great.