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Proper, thorough bleeding is necessary..
These engines have a ton of areas within the cylinder heads and blocks where air pockets can form that lead to hot spots... These hot spots can end up leading to cracked heads and cylinders.
To aid with bleeding you can turn the heat wide open and open up the coolant to the heater core which is at the end of the cooling system.. I usually rive cars a few miles with the bleeder open after having the cooling system opened up for service. In most of these test drives the cooling system will usually "puke" one good time out the overflow tube and then its all good to go after being topped off with coolant.
But I recommend pressure bleeding... Its the only way to ensure all the air pockets are removed.
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