Love to help you out mate but i really dont know much about the spec of the williams block, ill tell you what little i do know.
F7r engine:
Its 150bhp as standard
0-60 is around 7.5 (i think)
0-100 is around 19 (i think)
Top end is about 140 (also i think)
Cant really think of any bad bits that ive heard of, apart from the usual rear arches being prone to rust, the only weak link from the valver was the gearbox and they changed that as far as im aware of.
There are a lot of folk who know a lot more about these cars than me on here, 2 live, northy, Martin. and Thejesus are the first names that spring to mind, but there are a lot more.
As far as pictures have a look in the public gallery there should be tonnes of pictures of williams in there, or the media pics and video section.
Hope that helps