Another thing to keep in mind if you do the conversion. The swap to the Granada spindles may set the front wheels out an inch or more. This can be overcome by different backset wheels. We have a couple in our club and the wheels are noticably outboard from where they should be when you follow them in traffic. I wanted to retain my 14" wire wheels, and found a complete kit that worked and retained the stock spindles. Its a bit more expensive that way, but I didn't have to change the spindles or buy new wheels.
Good luck and ask questions. Lots of help on this forum.