I would Think...

Enough fuel in the carb to get it to drive 10 metres..
hookup coil power, starter motor power so engine can start and run left in 1st so no gear lever hookup needed
not bother bolting engine down

so basically drive shafts slid in by the 2 blokes underneath as the engines dropped down into it, dropped onto its mounts, connect up clutch cable

then the obvious, engine lifting tool was hooked on, bonnet not bolted on just fixed with the bonnet release etc