Ah, the good of days of point-style ignition. I bet a few posters here
will tell you to buy a Pertronix type of conversion kit, but I'm not
going to do that. Occasionally, it's nice to keep 'em stock.
GM had the best setup here and you could adjust them "on-the-fly", but
with a little patience, the Ford setup was okay, it just took a little
more patience.

Take the distributor cap off and you can see your old set of points.
Remove it with the two screws and replace them with the new set of
points. Now make sure your car is in park (or neutral if you got a
stick shift) block the wheels and put on your emergency brake. Replace
the condenser while you are there also. It keeps your new points from
pitting and burning up.
Now the tricky part. You will need to slightly turn the engine until
the rubbing block of your points is on a top of the distributor
camshaft lobe. You can 'tap' on the starter to turn the motor or you
can turn the motor with a socket on the crankshaft. Turn the motor
until (by using a feeler gauge) you have about .020 gap on your points.
Tighten the screws on your points. Put a little dab of grease
(available from you auto parts store or with your points if you got a
good set) on the high side of the distributor cam lobe so the rubbing
block on your points don't wear. Hopefully now your car will run after
all parts are reassembled.
The 24-29 degrees can only be measured by a dwell meter. It's the
degrees that the points are closed (out of 360 degrees in a circle) If
you don't have a good dwell meter needed to measure it, don't worry
about it. The cheap ones were inaccurate anyway.
After setting points, check and adjust your timing.
Don't buy a low quality set of ignition points. However, there are
actually very few good quality ignition points made anymore.