The first time I recall seeing Magnum attached to a Dodge engine was the 375/440 in 1967. The first 383 Magnum I recall was in the '68 Super Bee. At the time Mopar made a 330hp 383CID, which is not the Magnum. This engine, with the 440 heads and camshaft became the 383 Magnum and was rated at 335 hp.
I don't recall seeing Magnum anywhere near a Chrysler. I recall seeing a T-N-T pie tin on the air filter housing of a 375/440 in a Chrysler 300.
I've killed a bunch of gray cells since those sightings. Anyone else remember? Remember differently?