for the center, probably not. Don't really bother looking at spd for bigs (centers especially) when recruiting. If they happen to develop some, its a (probably minor) bonus...
I love spd in my bigs, but the cores MUST be met before any of that matters. A center with ****** ath, reb, def/blk will not be any good, even with 70 spd (although at that point I guess you might make him something else if he can pass dribble shoot, etc...)