78 was an oddball transition year. Cordobas got a facelift with rectangular headlights, wrap-around turn signals yada yada yada. Chargers retained the round headlights and previous year's styling. Plus, they threw the Magnum into the mix. I'm not enough of an aficianado to know the differences year to year beneath the skin. To be honest, until I did the gas tank search the other day, I would have assumed they were all more or less interchangable throughout the whole 75-79 run. Anybody have a couple of gas tanks they could compare? Say, one from 79 and one from earlier? My guess would be that the difference(es) are minimal and have to do with emissions weirdness that can be fairly easily worked around.