Engine will not turn over after engine swap?

I have the SUV listed above that had nearly 400,000 miles on the 4.8 engine. I also had a 2002 Avalanche with less than 200,000 on a 5.3. The body on the Avalanche was bad so I decided to do an engine swap. I only used the engine from the Avalanche. I kept all the wires and electrical components off of my 4.8 and used them on my 5.3. My battery is good and has a good charge. My wires are all connected I get power to my lights and stuff but here's the thing. The lights won't shut off and the engine does nothing.