I'd venture to say that the Ram Air I is an identical performer to the HO. The RA I was D-port and used the 744 or 068 cam. They had unique head castings (31), but I don't believe there's any substantial differences in flow between those and a set of 16s. Not sure what the differences were on the bottom end, if any. Did HOs get 4 bolt mains?
Ram Air II is different in that it had round port heads. Still a cast iron intake in '68. I think it used the 041 cam, but I could be wrong.
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Ken
'68 GTO - 464 - Ram Air II heads - 236/242 roller - 9.5” TSP converter - Moser 3.55 Truetrac ( build thread | walk around)
'74 Ventura 350
'69 AMC Javelin SST
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