You're going to have to dig deeper and get yourself a car that was built in that age and era. Talking about Mustangs, that could be a good starting point. But those cars are getting more and more expensive each day. But there are, of course, alternate solutions. Take this 1968 Mercury Cougar, for instance! The Cougar is the highest-selling nameplate ever built by Mercury, with almost 3 million units delivered in over 30 years.
For the first two generations, between 1967 and 1973, the Cougar was derived from the Ford Mustang. So it may be an excellent option if you wanted a Mustang but couldn't get your hands on one. Looking at the VIN of this car, you'll notice that this was factory fitted with an F-code 302 ci V8 engine. Back in 1968, this should have been good for about 210 horsepower. Right now, you're going to have to look for a replacement, as the engine isn't turning by hand.
The car has been off the road for more than 3 decades now, and that's easily noticeable by looking at the way the Augusta Green exterior and Medium Saddle interior look like right now. This car has only been driven for 60,000 miles (96,560 km), which translates to just over 1,000 miles (1,609 km) per year on average. The car is located in Maryland, but the bad news is that it's being sold with a bill of sale, as it doesn't have a title anymore. If $3,900 doesn't sound like a lot to you, then it might just be the dream project you had been thinking about!