[unruhjonny]

Originally Posted by SD73

Yeah. RA3 throws people for a loop because it's the only RA that's not a round port. ...

nope.

To clarify things, the "III" in 'Ram Air III' was coined well after the fact.
To the best of my knowledge in official Pontiac literature there was only the 'Ram Air', and 'Ram Air IV'.
It just happens to make sense in the cronology of Pontiac's 'Ram Air' 400cid engines.

• 1967-1968.5 Ram Air; RPO 'L67'; 'D' port engine known today as the 'Ram Air I'; used 068 & 744 cam c/w 1.5 rockers, standard intake, and specific exhaust manifolds.
• 1968.5 Ram Air; RPO 'L67'; round port engine known today as the 'Ram Air II'; used 041 cam c/w 1.5 rockers, standard intake, and specific exhaust manifolds.
• 1969-1970 Ram Air; RPO 'L74'; 'D' port engine known today as the 'Ram Air III'; used 068 & 744('69 only) cam c/w 1.5 rockers, standard intake, and specific exhaust manifolds.
• 1969-1970 Ram Air IV; RPO 'L67'; round port engine; used 041 cam c/w 1.65 rockers, two-piece intake, and specific exhaust manifolds