It’s my understanding that 318/340/360/5.7/6.1/6.4/6.7 share the same bellhousing bolt pattern.

Been over two years since I left Chrysler and if memory serves me that was a fact back then.

Now, the 518 has a cast iron pump held in the bell.
All RFE has a “hub cap” that covers the internal pump and is held in place with a snap ring.

Look inside a RFE bell and all you will see is that hub cap.
The pump is an aluminum body bolted to the case behind that cover.