Hi Frank,
Sure looks like two Wright Cyclone R-1820's. It would help immensly if you could get to know the date range when this aircraft crashed. It would help you a lot once you do your research. I know that many Missing Air Crew Reports(MACR) have engine numbers mentioned but as the photo's show it will be difficult to find any. I think the best lead for you would be to try to find out when this aircraftt crashed on go on from there.
Cheers Sander