I did it the hard way... That is, I didn't remove the core support, the hood, and I didn't lift the body. Doing it this way almost means the engine has to go in and come out sideways... I did have to undo the springs for the hood and prop it up with a 2x4 to get the 6.9 into the '94 truck.
When lifting the engine, I removed the two nuts on each engine mount that go through the crossmember, I took out the top engine to transmission bolts and the next bolt down on each side, leaving a bolt on each side tight. Then I got the engine as high as I needed to to clear the engine mount studs on the crossmember, then I jacked the transmission up until it was supported by the jack, loosened the bolts and made sure the transmission and engine were aligned correctly. This way when the engine goes back in, the transmission will already be where it belongs.
You have to pull the radiator. No big deal since the coolant has to come out anyway. I also removed the fan from the engine.
I did do it with a heavy chain between the lifting eyes on the engine, I had the chain as tight as I could get it, no slack between the eyes, that way there would be enough clearance for the oil pan to come over the core support.
It helped having Towcats' MASSIVE hoist on hand.
Go slow and steady, check the clearance on everything when the big moment comes.