Magnum Exhaust Manifolds in an A Body

A '64 is basically the same under the hood as a '65 or a '66. Not sure that goes for a '63 & earlier car though.

The 63 is the bastard child. No V8 was ever offered because it was designed for the slant. The firewall is different. It's different than the 64-66 and certainly different than the 62 and back. At least the Dart is. The 62 and prior Dart was a B body.