Nice article but it doesn't mention the 68 400 HO. My understanding is that the 400 HO was a Ram Air motor and goodies but without the open scoops and pan. I almost bought a garage find all original 68 400 HO (still kicking myself). It had the long branch manifolds. I don't think there was a 400 HO in 67. The HO in 67 was the hopped up 326.