Buick Nailhead Price Help?

My friend has a modified 1956 Buick 322 engine and a spare for sale, and neither one of us are involved in the Buick hobby enough to know what it's all worth.
Can someone here give me an idea of what all this stuff is worth?
Gerard's Automobile Book, Video, and DVD Store
  Click to see the full signature.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.