Using LX (New Charger/Magnum/300) Wheels on a 74 Dart

Hmm, mill out the center of the R/T wheels like you've got on that Coronet in your sig?
Thats kind of a pain...
The 300 and the Magnum have exactly the same bolt pattern and hub though, which is the only reason why I'm confused as to why you had to do that...

Not a clue to be honest. The first set of Magnum wheels we tried on a '73 Charger, thought they would fit, but ended up taking a BIG aluminum hogger on a die grinder with hours of grinding to make em fit. The '66 Coronet there we just threw up on a mill with the tire still on LOL. I think it has something to do with the center caps, but I'm not sure. And another set for a different coronet we had milled out. But the Chrysler 300c wheels just fit right on.