Magnum Heads

How many of you use, or know someone that used, magnum heads on their 360 a engine blocks? I've been reading about this and am interested to learn more as far as street engines.

Do they flow well enough in stock form to support 400hp? They need different head bolts right? The come with 1.6 non adjustable roller rockers? Magnum intake required(obviously) Is there a difference between the 5.2 heads and the 5.9 heads? Chamber size? Valve size? Know where I can find flow numbers?

I still haven't decided on the heads I will use on my zero deck 360 build for the street and am now considering this...(450hp target).

-Alex