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From what I remember Black Zero was pretty powerful. He was an evil adult version of superboy who captured superboys from different timelines.

Captain Britain can lift(press) 90 lbs

Regular Superboy is well above that already. Black zero should much much higher since he has matured and mastered his powers.

This still is a hard one to call.
http://challengersoftheunknown.com/SB64.jpg

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