2010Imperial

Had a leak in the stock fuel rail. Put a new, aftermarket fuel rail back on. Started the engine up, ran for a few seconds. Then starts banging around, making terrible noises then dies. Now the engine is froze up! It won't even turn over by hand. With plugs out! Gas on the plugs and in the oil. I am about to pull the heads, but was hoping I didn't have to.
WTF!?!?
I mean a simple 10 minute job turns into this!!!