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Hi, No direct experience but from a technical point of view the authority passed through the 301 would not be lost as such, just not of any use in ranking the new page since it is noindex. Once you allow it to be indexed it will start to appear in the search results and any extra push given by the 301 should be as expected. That being said, it might be an idea to noindex, follow the pages in question so any authority added can flow through your no indexed pages to your indexed pages. In that respect it is the nofollow rather than the noindex which is causing authority from the 301 to be wasted/lost.