I’m not a vintage Porsche, but I’ve been around the block a time or two with vintage vehicles of many marques since I started driving almost 50 years ago.
From the acknowledgedly limited photos shown of the car in question, the only thing I’d question is the body color-painted bands on the tops and bottoms of the front and rear bumpers.
I’ve never seen that before, but it’s plausible that this was a factory option on this limited-edition model.
And – a few aircraft-grade hoses on the engine, but these were period-correct (at least on airplanes) for the late 1950s.
Past that, I’d start looking at bolt heads and the washers underneath bolts and nuts for authenticity – this is an obvious “tell” and I cannot imagine any reputable restoration house or any high-end collector not demanding either 100% original or 100% matching hardware here, or in the case of a performance-focused resto, 100% provenance on the hardware that was replaced.
My choice is – ALWAYS replace everything with ARP hardware instead of refreshing cruddy 60-year-old junk. And replace hoses with newer stuff, but keep the originals for concours matching and fitment.
To put things into perspective, my 1969 Spitfire got a negative score (AKA below zero) at concours, but on our “play” race pitch, when I hit the top of first gear, everybody ran for cover in all directions except mine. A 1300CC Spit at 9000 RPM invokes that instinctive reaction from everybody, same as a growling mountain lion makes bunnies hide in their burrows.
It also took 10 minutes for the tire smoke to dissipate, even though I was negotiating the course and not just doing a burnout.
Good thing I sold the car to somebody who shipped it to Europe. If the buyer can find me – I painted the block gold, not the factory