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depends, the 416 kit revs a lot faster, but doesn't have the same overall power. if ur a bigger guy i'd say to go with the 426 kit, it's a nice balance between the quick revving 416, and higher hp 440.
on the dyno the 440 is more impressive. we have done all 3 (416,426,440) one guy had the 416 was happy but wanted to try the 440 and said he didnt think there would be that much more power
I was under the impression that 20-30 cc's really don't make much of a difference...unless ofcorse your building the motor along with it porting, valves, and such.