Both are tall. Both can punch. Neither can take a punch. Wladimir is the better boxer but Gerry Cooney is the faster starter. Wlad need a few rounds to warm up. Gerry has stamina problem so he will come out fast like he did against Ken Norton. Since neither has strong chin, whoever land clean first will win. Again there are 2 scenarios. Either Gerry comes out fast and KO Wlad in the first 3 rounds or the fight goes past the 7th round and Wlad KO Gerry. The later are more likely to happen since Wlad has improve much since he was KO by Corrie Sanders.
Cooney TKO 3
Hello sir! Great question too and Zebbie and Gannoway both nailed it with great answers so I am going to bow out of this one and just say that Klitschko would win either by decision or late rounds TKO.