Wiring help!

[Fawnzie]

Hey guys, I just dropped a 350 in my truck and I'm in the middle of hooking things back up. A couple of days ago I just wanted to get it wired so I could just turn it over and see that it works. Didn't need to start just turn over. The engine is a 350 with an HEI dizzy. I bought a new fire wall harness and it has four wires, Green (temp meter), Black (ground) Purple (ignition) and Yellow (which from what I've read doesn't need to be hooked up). The starter (Powermaster Power Max) has three posts Big one (going into the starter) Second big one (attach the + battery cable to) and a post with a screw in it (to hook the purple wire to). So, I got the battery wire, the purple wire and the ground hooked up. I go to turn the key and nothing. Am I missing something?