1970 Trans Am

[gasboddle]

I'm currently looking at a 1970 Trans Am. White with teal interior. 400 Ram Air, 4 speed. I'm new to the Pontiac scene and wonder how I would be able to tell if this car was a Ram Air III or IV.
The car is a one owner, rust free California car. Any assistance would be extremely helpful. Thanks.

 

[melsg5]

The Ram Air IV has an aluminum intake manifold the Ram Air III is cast iron. The Ram Air IV has round exhaust ports the Ram Air III had "D" shaped exhaust ports.