Cinquecento/Seicento 1.4 engine into a cinq (useful info and links)

Things i would definately recommend you replace while the engine is out:
Cambelt
Cambelt tensioner
Clutch and thrust bearing
Spark plugs
water pump
alternator belt
thermostat
exhaust gasket
driveshaft cup seals and locking clips
CV boots
Radiator


Other tools required that you may not have:
camshaft locking tool
angle grinder or lots of strong hacksaw blades
special clutch alignement tool of something fabricated
Circlip pliers


For removing your cinquecento engine please see this link or a haynes manual:

https://www.fiatforum.com/cinquecento-seicento-faqs/93884-engine-swaps.html


I would recommend removing the battery while doing this swap as the car is going to be in pieces for a while.
Also make sure the driveshafts are removed completely, not just from gearbox as they will get in the way
Remove engine loom and ECU
The only part of this you will need is the D4 connector as shown later, but make sure you keep it all as the wires will come in handy.
Take this opportunity to remove the OS headlight as it makes life easier.

However, before taking it out, make a mark on the bolt where the nut finishes.



The reason for this is you will need to cut the spare thread off of this to clear the cambelt properly. This can then be chopped off, making sure the nut still goes on smoothly. or replace with a self tapper as above.
Remove the radiator and cooling fan, as it only gets in the way later
You may want to fast forward and remove the cannister at this point