You know, I was going to type a big long response about brakes and stuff, but instead...
"What they said."
It won't be a modern car no matter what you do, it won't be as fast, fuel efficient, or a handle as well. I get to drive a friend's Mazda 3 around sometimes. I'm always amazed how little gas it burns, and how it zips around town and the highways. But you know what? Nobody waves at you. You don't get to check the oil when you fill up with gas, you can't drive with the windows down because of the "helicopter-effect". You don't even get to turn the headlights on, - the robot decides when its time. The seats are tiny, and don't have springs in them... Worst of all though, you can't drive with your arm resting out the window. I might sound crazy, but I'd rather burn more gas, go slower, and be comfortable. I once drove my '49 Pontiac sedan on a road trip (1700 miles), and although I burned twice as much gas (I got 19mpg), it was the first time I'd ever driven all day, and I wasn't sore from sitting in some miniature seat made outta foam. I also had my elbow resting on the window frame, where it should be.
