360/300 magnum Questions/suggestions

I'm not sure about block info since they were re-mans from Chrysler. On the front passenger side, there "could" be a sticker, yellow with a part number on it. My create short block had this sticker. It was also a re-man.

2nd question;

Yes. According to my research on these engines when they were new, I enquired on the phone at MoPar performance to this very thing. Both engines are the same except the:

Intake, cam, valve springs. Change these items and you can have the 380hp create engine.
(Which by the way never duno'd less than 400+HP. Ain't stock heads great. I wonder what a good porting would result in?)