1. Ferrari 308 GT4 (1973-1980): The estimated value of a well-maintained Ferrari 308 GT4 can range between $40,000 to $100,000.
2. Ferrari 308 GTB/GTS (1975-1985): These more sought-after models can have a broader value range, with examples in good condition potentially reaching prices between $60,000 to $250,000 or even higher.
3. Ferrari 308 QV (1985-1989): The Quattrovalvole (QV) models typically command higher values compared to earlier versions. A well-maintained Ferrari 308 QV could range from $75,000 to $175,000.
It's important to note that individual vehicles may have specific features or unique characteristics that could influence their value. Additionally, factors like regional market demand, rarity, documentation, and service history can also impact the price. As with any classic vehicle, it is advisable to thoroughly inspect the car, assess its condition, and consult with experts before making a purchasing decision.