As Mike (A12) said in his first post; the pics he showed were for a SB with A/C, not a RR. No 383 Magnum in a RR and both 383hp's (RR and SB) were 335hp. The 330hp motors were also used depending how the car was equipped. A RR with a 383 and AC would have likely come with the 330hp motor (not called a Magnum). Forget the Magnum thing, it's just a Dodge version of the Commando/Super Commando.
My guess is a non hp, turquoise, carter equipped 383 with the roadrunner pie tin is correct for your car and without a broadcast sheet, a Lynch rd. fender tag (not applicable to you) or the original motor, that's as correct as you will get.
....I hope that makes some sence; if not, someone smarter'n me will chime in shortly!
Cheers,
Dave