Do you have a part number for the kit?  March has fairly good descriptions of parts requirements and what fits on its web site.  Some will and some won't support a mechanical fuel pump based on the part number and the type of power steering pump that it supports.

I recently researched the timing cover issue. The one LMR sells as a reverse rotation cover for front sump cars is exactly the same configuration as far as water ports as a foxbody reverse rotation efi timing cover.
So, there is no reason to change timing covers. 
Just be sure to plug the two unused threaded 5/16” holes in the old timing cover (or on a new one) so they do not leak water from the back of the water pump.

On the 56 F-100 I put together with a 5.0, I used a foxbody reverse rotation clutch fan with plastic fan.

On jose’s 65 where we installed a 5.0 with reverse rotation pump, we used a stainless steel reverse rotation 17”  flex fan (no clutch)

Be sure your water pump gasket matches both the water pump ports AND the timing cover ports.  There are some gaskets that do not match, but look like they do if not compared closely.