the ford 555c TLB shop / service manual i have. was worth the 150 to 200 bucks i paid for it. gives full break down of parts and how to tear stuff apart and put it back together, testing stuff as you go. along with diagrams for most part each step of the way.
Document Moved -> north amaerica -> english -> parts catalog (some place along top) = a online parts manual diagrams are just enough to identify parts for ford / newholland stuff and get part numbers for everything. it might help ya identify gaskets and like.
i would more likely suspect coolant (water / antifreeze) mix getting into the engine oil vs fuel. the only time fuel entires the engine is during the fuel injection portion of the engine. everything else for fuel sets on the outside of the engine.
I believe if water or antifreeze was entering the crankcase there would be foam in the crankcase but their is none. I suspect fuel as the fuel tank is located above the engine .