03 Chevy blazer extreme, I'm going to try and make this as short as possible. Pulled 4.3 vortec motor and trans to completely rebuild motor. Rebuilt motor completely with all new parts, on first start put key in ignition and turned over motor, it tried to start but was backfiring pretty bad, killed battery trying to get it to start, removed battery and recharged, fixed timing issue number one and three wires were in wrong spot on distributor. Reinstalled battery and put key in ignition got some crazy stuff with gauges fluttering. Tried to start and Nothing happened no click of relay no nothing. So I tried to remove the key and it was stuck in the ignition. Would not turn far enough back to release key. Found the manual release under the ignition. Replaced the ignition switch with new key and switch. Replaced park neutral switch. But still nothing. I can remove the start relay and jump it and the starter will turn over. So I thought maybe a grounding issue so I installed two additional grounding wires to the front of the block. One to the frame and one directly to the neutral post on the battery, But still nothing. Key still gets stuck and no crank. Any ideas would be greatly appreciated.