Let me list what I think is the best combination.
- One ECU.
- Port injection.
- Timing belt or chain is fine.
- Ecvt or standard automatic with gears.
- HVAC controls with knobs operated by cables, not electric motors.
- Single bulb lights (LEDs are fine, but not integrated units where once they die, you need replace the whole headlight housing)
- One computer that handles all the body controls.
- emissions regulations complexity circa early 2000s
- backup camera
-ABS
- Cruise control.
- naturally aspirated.
- NO driving assists that require radar sensors. Like lane assist, automatic braking.
- no connectivity over the networks.
- simple gear shift maps that doesn’t require software updates.
- basically, something like a Panther, a Jeep inline 6, 2005 Camry or suburban.