Before you jump in replacing parts, with either a test light or volt meter, start seeing where you have power. With the key off, you should have power both sides of the coil. With the key on, you should have power to the points. If you don't, then start checking around the switch, be sure nothing is touching or grounding out in the distributor. Be sure the point pigtail wire is not grounding out on the upper plate or the side of the distributor body.