Classic cars are special. They require special treatment and sometimes lots of repair. The standard is so high, that even the brand new ones will require much energy, effort, and money to maintain. Since many of us cannot afford to meet these standards, we just settle with something a bit under the line.
Before you make yourself a classic car owner, consider a few things. You have to have the ability in working on cars and a space to restore it, unless you already allocate a great sum of money in your account to be spent in the local garage nearby. You will be the mechanic of your classic car. When you do, please remember that it is always safer to store your car under cover.
Do research also about your target car before you buy it. Do not buy anything that you will regret in the future. Find as many information as you can. Compare the current price to the car's condition. Contact your local classic car club to get information from those who are already expert on it. The information from a practical collector is always more useful than any information you can get in the internet.
Note that there are models of cars which can be easily rusty from inside out. One example is Morris Minor, which looks very fair and respectable from the outside but can be rusty in the inside. Consider also whether the replacement parts are easy to get. Even though there are markets which specialize in selling classic car parts, some models are just very rare so that no replacement parts can be found anywhere. In this case, then the only way to get the parts is by asking a professional to have the parts specially made for you.