You needs the flywheel on to start the engine, the starter engages with the toothy bits round the outside to turn it... You may get away with it with the flywheel on but gearbox off so long as you could bolt up the starter motor. Bit dodgy mind... and I would think that some form of engine mount would be needed to prevent the engine bouncing about and thrashing everything in sight.
This posting may have been helpfull, on the other hand probably not... Either way, I may have had drink when posting it in which case it's probably not as helpfull as it could have been
Work safe, and remember all technical problems can be resolved with a hammer, the trick is knowing where to hit it and how big a hammer to use (I often find it may also help to have a spare bit in the shed to replace the bit you have just mullered

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Work in Progress (or not as the case may be) I give you....
'O-no' the truck.Comments on 'O-no' the truck may be left
hereWork in Progress (or not as the case may be) I give you....
'Truck'Comments on 'Truck' the truck may be left
hereOwning a 2.8 is a hobby in it's self...