Ernie (poster here) asked me about this. In my opinion, the biggest functional disadvantage of owning an older (pre-computer, so – roughly – 1981 and older) vehicle is the built-in compromise of either decent fuel economy/highway legs or good acceleration off the line. Many of the cars from that era – especially performance cars and 4WDs – came with fairly aggressive final drive ratios and three or (maybe) four speed transmissions, without overdrive. The result was they were tire-fryers off the line but their engines were screaming at high RPM at fairly low highway speeds. For example, my ’76 Trans-Am (3.90 rear gears, no OD transmission) used to tach about 3,300 RPM to maintain 65 MPH; with a redline of 5,400 RPM, that is making the engine work. And drink gas, too. I swapped in a 2004R overdrive and the RPMS dropped to just over 2,000 at 70 in top gear – a huge difference. The car is much more enjoyable to drive on the highway and I don’t feel like I’m tearing it up just trying to keep up with traffic. This swap can be done easily and fairly inexpensively with just about any older/classic car and is in my opinionmore bang for the buck that the more common/popular switch to EFI in place of the factory carbs….