I would expect that any 67 L78 car with the original engine would easily be a 6-figure car. With fewer than 1,200 built, it's nearly as rare as the 602 Z28s from 1967. And, like the Z28s, probably many of those 396/375 were beaten to death at the race track, as they were purpose-built cars back then.
I know that, due to rarity, the Z28 is the Holy Grail of 1967 Camaros (maybe in each year of 1st Gens, really). But, for me, I'd take an original RS/SS L78 every day of the week over the Z.
Now, if it's just a car that has a verifiable birth record as an L78, but the original engine is long gone, I think it's much less interesting. It would still be valuable and more valuable that anything else other than a Z. But, I don't think it gets into 6 figures without the original engine. E.g., an original L78 car that now has an LS3 and so on will be an expensive car, but won't touch that original 396 car. Obviously, just one man's opinion here and I'm happy to be wrong.