Points and condensor should always be treated as a unit and replaced together and they are cheap enough to do so, that's the first thing. Second, if you do not have a proper gauge and know the gap then setting the points is next to impossible, especially if you are running the old school upgrade and have dual points. Now, a match book cover is about the right thickness and can be used in a pinch to get them close enough to start the car but they should be properly gapped. If they aren't enough the car won't turn, if they are too much you will get backfires.
Honestly your best bet is to switch over to a Pertronix system. Installation is a no brainer and it takes even less time then you'll spend gapping the points properly. I have never been happier since I did it and I enjoyed tuning the car the way it was. If you have the money I would suggest you do so and keep those new points and condensor in an emergency trunk kit with a flat head screwdriver like I do just in case years from now the pertronix does go bad and you are stranded. Old school is still the best way to get you back up and running in a pinch but new school is the better way to go fro day to day reliability.