Yes you can use the same carb, just moves from one place to the other with a rear induction reed set up.
also the newer backplate will have the carb bolted on straight like the 50&55 are. Also It will utilize the internal pulse port not the external as shown in the pics. It will still allow for the carb to be turned 180 if needed.

In the DLE-30 thread Jody gave the RPM numbers with the rear carb set up. steady idle down to 1450, and a top RPM of 7200 on a new cylinder,piston and ring using a 19x8 laminated prop. That alone is great but with some run time it should even improve.

The original cases are done on a CNC and the deck height is the same on all of these engines so a complete case is not needed for the change over.

As far as presserizing the fuse, Who knows, alot depends on the type of aircraft, round cowls planes seems to be the worst.
I make it a standard practice to use a line from the pump plate to a pill bottle on all of my gassers just in case.
Hope that helps.