After this mess I ordered the Ford & GM templates from Beydler
I have not used them but I have at least 4 jobs to do. I feel the only thing that would have worked in the above case would have been the 17/64, plus I now have a guide to do 21/64 since I had to heli coil 3 holes. I can say the service and info I got from Beydler's so far has been second to none.