How do modern cars regulate temperature so well?

Think about all the technology that newer cars have that are meant to keep everything running in a consistent range. They have EFI which keeps the air fuel ratio the same. Also, 4 valve per cylinder heads with variable cam timing, along with ignition systems that can start dropping cylinders if things start to get too hot. Add that to some of the other things already mentioned and our old cars are barbaric. My plan is to run EFI, big radiator, high flow water pump, with the best thermostat I can find, plus electric fans and controller, and hope it keeps my 408 cool.