Not Ranked
I would agree with that. Weight savings is the only real plus that I can think of, but the engine sits behind the front tires on a Cobra, so I'm not really sure the weight loss is that critical, unless you're counting curb weight.
Edit....
Just thought of another plus (trying to be fair)....
On an iron block, if you start with a 4.250" bore, you have plenty of cylinder left for future rebuilds, since most of the aftermarket cast iron blocks will go to 4.400" and higher. On an aluminum block, the sleeves aren't that thick, so you may not have as many rebuilds with the included sleeves, but you can always buy new sleeves and put it back to the bore size that you were at.
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