My understanding is that the cab has to be pulled on any of the modular engines to do the cylinder heads and for motor swaps. Shoot Dustin a PM--he's a Ford Senior Master Tech. He should be able to clarify that for you.
I, however, have heard of someone using a stud remover and unscrewing all the head studs, then somehow holding them in the head and above the block so that the head could be removed without removing the body. Now if that's true, I'd like to see what he did to hold the studs up.
If you know what you are doing, there are ways around pulling heads on the mod motors, I have done a few of them now, where the cab stays on, and to get the heads off (they are not studs, they are bolts) I support the bolts so that they do not stick put the bottom of the head using sections of sliced heater hoses. That is the way all of our techs at our shop who work on diesels and gas engines, do to hold the head bolts up while changing head gaskets.