Cars like other pieces of technology are gradual. Its pretty easy to pick up a 90's era car with electronic fuel injection and spark advance while still having a fairly simple emissions system, and actual relays and mechanical buttons to turn on things like cruise control.
If that is to much, you can go back to the early 90's or late 80's for systems where only injectors are electronic and based solely on a couple simple sensors (mas air, or o2 sensor) and things like spark advance are still done in with a distributor + vacuum. Its all a question of what you want to tolerate, but the advantages of EFI+electronic spark advance or VVT are immense for both reliability and efficiency.
If that is to much, you can go back to the early 90's or late 80's for systems where only injectors are electronic and based solely on a couple simple sensors (mas air, or o2 sensor) and things like spark advance are still done in with a distributor + vacuum. Its all a question of what you want to tolerate, but the advantages of EFI+electronic spark advance or VVT are immense for both reliability and efficiency.