Here's a list off the top of my head:
1) Frame tabs (weld on) for the diesel motor mounts.
2) Radiator is way different. Plus hoses.
3) Air Cleaner assembly and hoses.
4) Inner fender panels if you want to mount the air cleaner cleanly and correctly.
5) Throttle pedal, relay brackets, cable and linkages.
6) Hand throttle cable (optional but very usefull)
7) Exhaust system complete from the flange gasket back, including hangers.
8) Vacuum source (alternator mounted pump or aftermarket fender mounted alternative)
9) P/S hoses and cooler
10) EDIC wiring, relays and such
11) Small electrical supplies to re-route the F motor wires to the H motor sensors and alternator.
12) Diesel specific bell housing, flywheel clutch, throw-out fork and hydraulic slave cylinder.
13) Tach sensor and compatible meter (not sure if gasser meter is compatible).
That's all I can think of at the moment. There's probably more but I haven't had my second cuppa this morning.
Rick