Any guidance on my 1970 Duster plans

The way I read it the seller sold him the engine weather it is a 340 with sixpack, slant six, or a 426 Hemi under the agreement to personally use it. Instead of the engine just sitting, it would be going to used by him personally.
The last things I sold I in no way would have practically gave away. I was lied to by buyer's stating they needed it for personal use. Prices were to help them out with their projects. Only to see them right away sell the stuff I gave deals on based solely on the fact it was helping them out with their ride. Some stuff was even begged, I need it sell/give me it.

So when I read guys say sell it that's just not cool. It was bought with the intention of the buyer using it.