Test the starter!! Run a 12v wire from the Big bolt on the starter, then remove the little wire and touch your 12v wire to see if it turns over, if it just clicks then starter is bad!! .. If it does then go to the safety neutral switch on the clutch pedal and unplug it, use a jumper to each side on the plug, try to start car with key..

Now just a dummy question, but do you have a ground from the frame rail to the tranny? If not then make one and see if it starts..

Its easy to check the ground or the starter, so start with ground.. then go to starter!!