Well, the engine change took only about 10 hours but I have spent the last 3 weeks trying to get the new engine to start. The issue I was having was no power was getting to the Starter. Had the Chrysler lead tech come out to my house (good to know folks) and hook up his computer and the PCM was not communicating. So I borrowed the service manuals from Chrysler and my buddy and I ran though the troubleshooting trees for no response from PCM. Guess I should clarify that I am not a car guy, but my buddy is a motor head from way back. Anyway, we shot all the wires and it showed several open grounds. When I installed the newer engine it was a 2007 engine going into my 2006 crossfire. We had all kinds of cosmic thoughts about anti-theft lockouts, starter lockouts, SKREEM(I wanted to), but ultimately figured that somehow the 2007 wiring harness was not compatible with the 2006 car, PCM, RCM, etc. So, I pulled the harness off the old engine...crazy that you have to pull the intake manifold to disconnect the two anti-knock sensors. Then I started pulling the harness off the new, installed engine. I got the easy stuff disconnected on top first and then decided to tackle the difficult connections...alternator and starter. When I started pulling the alternator, I noticed that the outer protective sleeve of the wiring harness had a small crack. I bent the sleeve back and found that the main power wire was cut in half and the three other wires were severely damaged. I Spliced and tapped the wires and reconnected all connections...damn thing started on first try and ran great. So, for all of you having mystery start and no start issues, comply with your mystery no start RCM procedure and then start checking your wiring harness. On a side note, I think my crossfire had engine issues since I've owned it. I bought it as a second owner...car had 11K miles and i got it for only $17k…thought I got a great deal. It ran fine for several years before the engine hard failed hard (still haven’t had time to tear down the engine but we are thinking cracked or broken ring)...the engine I just installed quickly showed me what I had been missing. Amazing the difference in torque and get up and go. wow!