How to install a distributor cap and rotor on a 1985 chevy truck?

I have had good luck with Echlin caps and rotors that are from NAPA.
You are going to need to mark your spark plug wires so you can get them back on the new cap in the right place. Tape with numbers on it or what ever you can come up with. There should be 4 screws around the lower part of the cap. Take your screwdriver and push down on the screw and turn like a quarter turn counter clockwise and you will see it release from the distributor. If you look at the new cap you will be able to see how it works. Once you have the cap off you will have to transfer the coil to the new cap. There should be 2 small screws on the top of the cap that hold the cover over the coil.
I think there are 4 screws holding the coil in to the cap and you will have to pull the wires and terminals out of the cap as you are removing the coil. Be careful when you retighten the screws in new cap.
When you replace the rotor you will see by looking at the bottom of it that it can only fit one way and lock on to distributor.
Just take your time. If you have any problems I will try to help.

Remove distributor 99 chevy 4.3 how you put it back in right spot