I have used detroit diesel green for the mopar turquoise, its a dead ringer
I had a 66 coronet years ago with a 225 slant and it was painted orange. It was the original paint on the engine.
Also owned a 1969 dodge dart western sport special 225 slant , it was turquoise blue.
Had a 1970 barracuda coupe with a 225 slant , it was the mopar corporate blue (not turquoise)