Yep like bbrroowwnn said, the factory used this type of valve cover on the 273 Commando engines. Not sure how hard they are to come by. I redid my covers by removing the old paint and using "wrinkle paint", then baking them in my wife's oven (she wasn't home at the time!). It's been about two years and they still look pretty good.
Thanks!! I was in a hurry to get the motor in so I used Hemi Orange paint. Next time I pull it I'm going to go with something closer to the factory block color...I've heard Chrysler is close. The engine bay is the original paint...complete with a run on the firewall.