572 Hemi / Is it Worth it?

Dollar for dollar, isn't it cheaper to buy a crate Hemi from someone like Indy that is allready assembled and dynoed?
Any block problems etc. should be taken care of before shipped or am i wrong?
The individual pieces, shipping, machine work, and assembly would cost a lot i think.
Let alone all of the time and tools involved.
Has anyone tried the new A-body Hemi headers that have come out recently?
A Hemi A-body is one of my bucket list cars!