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The so-called Atkinson setup usually features a higher compression ratio than its regular equivalent. That might be not required with the Miller setup because it uses a supercharger. Without a timing retard I'd probably not want to run more than 10:1 CR in any engine which didn't feature direct injection, altough if you go with the cam retard you SHOULD go to 13:1.
Miller-cycle engines were relatively popular during the 40s for marine and stationary applications such as gensets. Basically, they had the intake cam timing retard and a supercharger, quite a cheap mod. In the 90s it was used by Mazda in at least one version of the 929, and currently Nissan uses it in some versions of the Micra.
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