Rick,
Here are a couple of pics of my G 38 in the process of being converted to ei. The carb block is rotated and a new pulse hole drilled. the old one can either be covered by the two gaskets on either side or filled with some epoxy. I also mix the epoxy with chopped fiberglass strands to fill any counter sunk holes etc I dont need and to make it look more "professional". I have been doing this on all my 'conversion' engines and its worked out great so far- no air leaks etc..