/6 to V-8 swap question

I am trying to get more info on the donor car to see what rear and trans are in it. It should be a 904 and 8.25 hopefully. As for the K member yes I will be getting the adapter mounts.
Thanks for the hopeful good news that the shaft will fit guys.

Are they both disc brake cars or both drum brake cars? Why not used the K frame out of the V8 car in yours because everything will bolt up to it?