This pic which was posted many moons ago, you can see the two piece sump/pan, alloy ?heads & intake. This pic would suggest the heads were alloy as well, but remember its obviously a display/mockup assy.
Some of you guys need to spend a bit more time on the search button, all of this stuff is on this site, sometimes you have to think outside the square when looking and follow the odd link or two, but its all here.
Also interesting is that I saw an old 352/390 on ebay yesterday with those rocker covers on it , $$$ at the time was not much either.