How is it now? Any leaking? I'm about to do this for my dart. Had to put the project on hold. Did you use the block off plate to completely seal or put a choke cup on? If the former, did you get the electric choke kit?
Did you ever attempt what was suggested by slantsixdan? I have a 70' dodge dart swinger 225 with the same situation. Are there any alternatives other than what was suggested?