SL6 will not start with the key.

I have a 64 Valiant, I had the motor rebuilt and put it in a few days ago. Before I had it rebuilt it started up just fine just didn't sound so good. We got every thing in and hooked up now the dog-gone thing will not start with the key. Just makes a click at the relay. Some times when you turn the key to off position the voltage regulator makes a click. I can jump the starter with a screwdriver and the starter will turn. I have replaced the starter relay, the balast resister, battery, starter and the ignition switch. I thought it might be the neutral safety switch but a guy told me to ground it to the battery negative post and if it still didn't start that it wasn't the switch. not sure how right he is. When I installed the engine the car was at a slant on my driveway I ask my wife to put the push button tranny in neutral from the park position in order to install converter bolts in doing so the car lerched backwards, could this have something to do with why it will not start with the key like maybe its not in the park position? My knowledge of electrical trouble shooting is basic. Any thing you can tell would be greatly appreciated. This is driving me nuts. Thanks, Jerry