A500 swap help.

Hi

I am going to swap my 904 to a500 to my 72 318 duster.
A500 is coming from 91 dodge van with 318.

I know that i need to cut crossmember and fabricate new transmission mounts.
thats not the broblem, or shortening driveshaft, i have done it already once with my rear swap.

But i like to know do i need anything else from that van for the transmission swap, i am now getting transmission and torque conventer.

My old flex plate should work with a500 trans?
but anything else i need to get from that van?