I agree with Rick L. -- post a message on the FE forum
332-428 Ford FE Engine Forum and invite suggestions. You're likely to hear a recommendation to pull the rockers, pressurize the coolant, and see if you see something bubbling out. You might also receive this suggestion:
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Try sealing the head bolts using liquid teflon thread sealer on the bolt threads. Pull the 2 head bolts where the oil comes up from the block, clean the threads with spray carb cleaner like Berryman's and wipe the hole clean and dry, this is very important. Coat the threads of the head bolts with liquid teflon thread sealer and re-install, torque to specs. Re-install the rockershaft. Flush the cooling system with machine dishwasher detergent such as Cascade [low sudsing], it may take a couple of treatments to get the system clean as oil will mess up the radiator and cooling system. If you live a charmed life and the stars are in alighnment the teflon will seal the crack in the deck of the block where the oil passage and the head bolt hole are the closest. I had the same problem with a D4TE block and using the recommendations of "Engbldr" of this forum I cured the oil-in-the-coolant problem. No guarantees this will work but it just may save you a whole lotta work if it does. Otherwise the engine has to come out and be torn down to do the sleeve-in-the-oil-passage trick if you go by the AERA service bulletin issued for this problem.
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