Ah, Well so much for the internet.
As for Teddy Ballgame, if he'd faced this guy he would have mentioned it, in a letter, a conversation, an interview - how many interviewers asked him who the fastest pitcher he ever saw was? All of them, is how many, I'm certain. Drive all the way to see the guy and never mention him? No way. If he didn't talk about facing Steve Dalkowski, he didn't face him.