I agree with almost everything our sage writer said above.
We all like to improve things from what they were back then. 50s Speedster, you say?
We have more power, better brakes, better tires. Most have added some anti-sway. Some have even(gawd!) changed the swing axle for IRS. How about that rack and pinion steering?
My point is we are all at least a little bit AWAY from the "original" experience.
The real question though: Where is our own personal line drawn? Is it radial tires? Disc brakes? IRS? Crank-fire ignition? 5 speed?
Or is the line EFI? Or the biggest line of all, gateway to all disconnection: drive-by-wire?