Tonyd:
I should have taken some pictures for you as I am just finishing a similar swap. The devil is in the details of this:
Pre work:
Go to exhaust shop and get the 3 bolts to connect the y-pipe back together. Get intake, valve cover and exhaust manifold gaskets.
1. Clean both trucks engines/engine compartment (Degreaser, etc). So much nicer to work in clean environment.
2. Spray the exhaust manifold bolts with penetrating fluid if possible (if they are being used obviously not possible). (This may not be required if both engines have exhaust separated at y-pipe, and have EXACTLY same manifolds, but if it is required, you will be happier if you did it ahead of time). Impacts are usually more successful in removing 'frozen' bolts as they apply just a torque; while wrench often adds a bending force...
3. Disconnect battery, intake pipe. Block vehicle, put in neutral.
4. Beg, borrow, steal fan removal wrench (undoing bolts on fan and/or water pump pulley does nothing...) Getting fan out of way allows for lots more room.
5. While I agree fuel lines are pain in @$$; I separated them with $2 tool from local parts store (and lots of colourful language) *see subtle differences below.
6. Remove serpentine belt and alternator. (bolts for this are fairly accessible). I have my assistant put parts in labelled sandwich bags as removed so I can find them for re-installation.
7. Remove a/c compressor if truck has it. I removed the power steering from the engine as I haven't figured out how to remove it with engine without making mess. There are a couple tricky bolts to access.
8. Disconnect electrical wires (including those to transmission) & radiator and vacuum hoses (Take some pictures). I remove rad, but then I don't trust myself not to hit it and would prefer not to replace it.
9. Open front cover plate on transmission; remove 4 torque converter bolts (assistant may be needed to stop engine from rotating while breaking bolts free; then turning to next after first one is removed). Then unbolt transmission (6 bolts).
10. Cut y-pipe bolts with saw. (Appropriate power tool noises).
11. Review the only thing left to remove are the 4 nuts on engine mounts.
12. Chain from exhaust manifold to exhaust manifold, connect to hoist and remove nuts. Lift off engine mounts, pry engine off transmission locating studs, then lift engine out. I put hydraulic jack under transmission to ensure it doesn't want to tip forward. Torque converter should stay in position in transmission.
13. Have adult fizzy BEvERage.
14. Set 2 engines side by each. Compare Intake, Valve cover and exhaust manifolds to ensure they are ABSOLUTELY identical. (my '98 had EGR off drivers exhaust; new one didn't; new engine intake was plastic and pointed slightly different direction than '98; injectors from '98 didn't fit in newer intake; PCV from valve covers was subtly different, wiring was very different. So, I swapped all the '98 stuff to the new engine...reference new gaskets in parts section)
Reverse process to install.
If transmission doesn't mate tight with engine without assistance (arm strong is allowed but no mechanical aids), pull engine back and confirm torque converter is fully installed (push and twist and repeat as required - there are 2 or 3 'interlocks' before torque converter is 'seated'. Using bolts to 'suck' transmission and engine together ruins the front pump, necessitating transmission replacement). Once 1st bolt is in torque converter, assistant can rotate engine to access remaining.
Use torque wrench liberally to avoid over torquing.
Return unused parts/fan wrench.
Enjoy more BEvERageS.
Let us know how it turned out.
A little long winded, but I'm trying not to miss any thing.