A question of originality

Some OEM parts are worth rebuilding or reconditioning or refurbishing - whatever you wish to call it, but any part of brake system can definitely be replaced without fear of compromising originality. But I would suggest to shop around. C.I. not always best deals. Try R.A. or Parts Geek, etc. If master cyl. questionable, replace it with new or rebuilt part as it will be dependable and safe and totally look like original - not some silly 'upgrade' to eighties style aluminum unit. Another example is steering components. Common-sense says to replace only what's necessary but everything can be totally stripped and detailed. Tight ball joints and tie-rods need only cleaning, new boots and good grease. Engine? As much 'numbers' stuff as possible, for sure, including manifolds and (T.Q. - 6139) carb, plus electronic dist. If changing intake and/or exhaust, suggest save original stuff (unless already gone).
My own belief is that a 'trailer queen' car more likely to have all new parts - since they mostly go to shows and have to 'sparkle' inside, outside and underneath. A 'daily driver' can look just as good and cost less $ to get that way and be totally safe and reliable. Most of us don't have deep pockets (like clients of Graveyard Carz), but we do make up for it by having extra time, patience, hidden talents and ingenuity. Suggest factory service manuals and resto books but not on-line video tutorials - as the latter full of very bad ideas and repair procedures. Take your time, make it safe and have fun driving it (yes, like you stole it).