There are many things that make our modern engines drastically different then the engines that your father or mother had in their car, and I'm not talking just bhp or torque. I want you to go look under the hood of a classic car, and then, I want you to go out and look under the hood of a car built in the last ten years. Under the hood of a classic car you'll notice there is ton of space all around the engine. Under the hood of any modern car every spot will be filled with hardware.
What really fills up the space in a modern car's engine cavity is all the electronics. If you car broke down in the sixties, as long as you knew a little about cars, you could pull out a wrench, pop the hood, and tweak around until the car started. Now if you car breaks down, you need to call a tow truck and you can say goodbye to your car for a couple days while they hook up some computer to those little black boxes under your hood.
I'm not saying we should revert back to our classic car's engine. Our modern car engineers have greatly advanced the internal combustion engine. Those black boxes under your hood do several important things. They improve safety. If you have ever gotten in a semi-serious car accident, you may have noticed that you car wouldn't start again. This is because your engine might have some dangerous internal damage. Those boxes also improve your gas millage by optimizing fuel injection and valve action. Finally, and possibly most importantly, those little black boxes improve your speed and bhp by optimizing several things in your engine, similar to how they improve gas millage, including fuel injection systems, valves, and cylinder pressure.
Both types of engine, the modern and the classic, have their own pros and cons, so depending on what's important to you can either buy a new car or buy a classic '65 ford mustang.
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