which 833 for a body ?

Recieved this in a message...

http://www.bigblockdart.com/techpages/abconv.shtml

So,it can be done. And honestly I will beat the hell out of it at the track. Thats just who I am! There is an 18 spline b body available locally. Not cheap. So on to the next obviouse question. Whats an 18 spline b body A-833 worth?