All of the brake lines that I've replaced on my '55-'56 Packards had the 45-degree double upset flares.
I'm not sure about the steel fuel and vacuum lines as I haven't made of those yet, but do know the tube for the choke heat pipe is swedged for a slip fit the exhaust crossover fitting.
Not to drift off-topic, but I've attached a pic of a great tool to help form the tubing without kinking.
This is K-D Tool's #2189 tubing bender, but the one I have is from Plews - looks identical, but has red vinyl-coated handles. I picked it up from a "tool trailer" at a swap meet several years ago; perhaps Plews sold out on this one to K-D. To date, this bender has done everything I needed - except for a very tight 90-degree bends, close to the fitting, on a later model car.
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