Get a Smoother Ride
Many suspension components are designed to be replaced. Shocks and struts were never meant to last forever. Likewise, aging bushings can negatively impact your ride as they age. Upgrading these pieces can help bring back your Mustang's original feel.
If you're looking for something more responsive than your Mustang's original suspension, then you might consider upgrading to a coilover suspension. Not only do coilovers offer more responsive handling, but they also provide a method of lowering your Mustang. Having a lowered classic Mustang improves its handling, but it also looks phenomenal.
If you like to whip around corners with ease, then reducing your Mustang's body roll is a must. This can be done in several different ways. Upgrading your sway bar is effective and very easy. You could also invest in a set of subframe connectors to add a little stability. An export brace can also help to improve your Mustang's overall stability and handling. If you really hate body roll, you can always combine these methods for a solid and stable ride.
Not the year you're looking for? Check out these years: 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, or 1973 for additional options.