I have a 68, 350/v-8 small block. After the car sitting for a month I went out to start it up, nothing. No power, lights, horn or clicking. Jumped the battery and nothing. I played with the power cable from the battery and the interior lights came on, then I tried to start it and all power turned off again. I changed out the batter and nothing. I'm waiting for a litlle better weather to jack it up and check the power cable to the starter and the fuse line out of the starter. Any other ideals of what to check for?? Thanks

This sounds like a bad battery cable connection at the positive terminal, on the battery.....Are the battery cable terminal ends clean and tight?

Yeah that was the first thing I tried. Bought a new batter and sandpapered the inside of the terminals to ensure proper contact.