Here's a pretty cool Black Widow build including some historical stuff.
http://www.57chevyblackwidow.com/album.html
There is a complete build here. I didn't know the 283hp/283 heads had 2.02" intake valves. Could that be true? I didn't think the 2.02" valves came out for several years later. http://www.57chevyblackwidow.com/update32.htm