Ford Racing 427 Alum block specs

Has anyone seen the actual specs on these crate engines? I've seen differing comp ratios (10.5:1 vs. 11:1) on different sites. There is plenty of info on the Iron block versions; however, the real data for the Alum blocks is hard to find. I have seen anywhere from 570 to 600 HP and 527 to 553 Ft Lbs???

Does anyone know someone with this set up? Thanks.

Source: http://www.clubcobra.com/forums/small-block-talk/113815-ford-racing-427-alum-block-specs.html

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