I am by no means an expert on this subject as these cars were made before I was born. The limited knowledge I have is that the long ram induction was available on the 60 300 F and the 61 300 G. The 62 300 H, 63 300 J and the 64 300 K offered an optional short ram intake (15 in instead of 30 in).
That being said how much demand is there for one of these? I guess if a person need 1/2 for a resto project it would be a good deal. I think it would be worth more if it was a set but who knows.
~Michael