I get what you're saying but does that mean I need to sell all my TV's and other tech as they're too modern for the era my house was built in?
That's where this bit comes in Chris :
"unless you were to make everything else on the car just as modern and then it would be a modern car in a 20+ year old shell"
Modern tech, tvs, computers, tablets, laptops etc in a 50+ year old house. Thing is it's more acceptable in a house than in a car where things have changed as technology moves on so the cars generally need to be "period correct" to be an accurate representation of what they were when new.
I say generally because there is the retro-mod movement - nothing to do with a bunch of rockers, Vespas/Lambrettas and Quadrophenia but more a case of updating a classic car with modern bits while keeping the outward appearance as it left the factory, except perhaps for the wheels and then usually something that is close to being a period-correct style.
For example, a Triumph 2500 PI with a modern set of 5-spoke alloys similar to those originally fitted and otherwise externally the same as it left the factory, most of the interior as it left the factory too but all trim refurbished using modern materials, added features such as heated seats with electric adjustment, electric widows, central locking, alarm/immobiliser etc, LED or HID headlamps that still look like the originals and then the piece de resistance
, something like an RB25GTT engine and box from a Skyline/Stagea to keep the original 2.5L capacity and driven wheel configuration but with modern reliability, economy, unleaded capability and errrr............. oh yeah, GRUNT