2slow4u

If I am running a 347 with decently big cam and afr heads, am i gonna be askin for trouble with the block? My block cast # is EOAED3C. I think this may be a Bronco block. not sure. Any help/opinions are highly appreciated. I know about 500 is the limit and that sounds about where I was gonna be. Plus I wanted to use nitrous. If anyone can find out what block this is or know where I could find out it'd be greatly appreciated. Thanks