No spark.
Take off the old one, put the new one on.
will a 1995 Chevy 350 lt1 motor work in a 1990 Chevy pick up
Yes you do. You have to take the distributor shaft out of the distributor to Remove the pick-up coil / stator.
look at the coil, it is marked - or +
If it's bad it will not start. You should also check the module that's in the distributor first.
INSIDE the top of the distributor.
Stick with the coil recommended by Mallory.
Bad coil Bad rotor
If you are asking about changing the ignition coil that is mounted on top of the distributor cap, it is held in with two screws and can easily be replaced.
check your rotor & pickup coil
Yes.
Next time you replace the coil, test and if necessary replace the resistor.