[Ross F-1]

I'd swear I saw this pic here, but can't find it. Ford actually posted it on their Facebook page for some reason. My question is, what are those funky bellhousings for? Irrigation pumps? I can't figure why some are truck engines and some are car engines, some with a sheet metal cover on the lower BH, some with big holes in the upper half of the BH's. Anyone know the history on this? (If this was on here already, can you point me to the thread?)