A 215/70/15 is really tall. That's a 26.9" tire in the front
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I wouldn't go down to a 205/60/15, that's only 24.7" tall. If you wanted to step down to a 205, you could probably stay with the 70 series as a 205/70/15 is down to 26.3" tall. Or, you could go with a 215/60/15 at 25.2". Still a little short, but not horrible.
What's the width and backspace of those Cragar's? I run a 225/60/15's on my Duster at the moment with cop rims. That's a nice sized tire in the front, would still be shorter than your 255/60/15's but at 25.6" it'll do a good job of filling up the wheel well.