Yes, Muhammad Ali owned an Alfa Romeo Spider in 1976. He was actually looking for a Rolls Royce when he decided to get that Spider for his third wife.
However, they did not keep the car very long) and gave it to a friend the same year. The problem was that Ali’s wife did not know how to drive a manual gearbox and never learned. The family friend kept it for 40 years before selling it to MotoeXotica, a classic car dealer.
The car was recently sale on ebay for $43k, which is probably almost twice the price for a similar Spider not owned by a celebrity.
The car is definitely in good shape, recently repainted in its original color and 80,733 miles on the odometer.