That was an antique Ferrari, wasn’t it?
It was a replica based on a 240z Datsun.
The original Californias are 20 million plus now. The GTOs are 50 million dollar cars.
It was a 250GT California Spyder - or, at least, a reasonable facsimile thereof. Like most other Ferraris of this era, a real California Spyder is very rare.
There are a few shots of real Ferraris in the film, but for the action shots they actually constructed replicas of the car.