Air will tend to collect in the engine and in the top of the radiator.
In a typical front engine car the engine sits at an angle, with the front of the engine higher than the rear. This coaxes air to migrate to the front of the engine and escape via the thermostat. In the Pantera the engine sits more or less flat. So raising the front of the car, with the engine running at operating temperature (thus the thermostat is open) will allow air trapped in the engine to escape. Air is purged this way during normal operation each time you drive uphill, or negotiate a steep driveway, etc.
If there's any air trapped in the left-hand under-car pipe, it can be purged by raising the rear of the car while the engine is running. Of course, any air trapped in the left-hand pipe is going to flow into the engine ... requiring raising the front of the car to remove it from the engine. Any air trapped in the right-hand under car pipe will flow into the radiator when the front of the car is raised.
The radiator will have a fitting in the top of one of the tanks. Opening this fitting will allow air to escape the radiator. This is best done while the coolant is cool, to avoid the obvious hazard of burning yourself with the hot coolant. Unless you've modified the vent system as I advocate, the top of the radiator is the major air collection and purge point for the entire coolant system, and air should be bled from there on a regular basis.
