Personally I like the idea of oem+ when it comes to modding cars.
But then there are some cars that are so ubiquitous it doesn't feel like it matters and then there are others (MGs and Minis spring to mind) where modding and engine swaps are almost integral to the cars image.
I guess the DS is one that I don't mind being turned into to a milk float. (Jetsons worx)
Classic cars being converted however is something that doesn't appeal.
Call me a ludite, but the heart is the engine.
Bit like classic watches, they shouldnt be altered.
Imo.