Under ideal circumstances, I would have to say my 57 Olds. Great old car, heavy, stable, comfortable for 4 with the rear console, plenty of power with the 371 c.i. and the 3x2's. But with an mpg of 6-10 and today's gas prices, it doesn't get the long haul use it once did. In order to make it better, it probably needs an upgrade to a 502 with Mooneyes 3x2 injection and a 700r4. That's just what the old girl needs, unfortunately there are to many other priorities right now.