Welcome I'm Chris aka Moose
Unable to spin the engine manually means the engine is seized, or there is a bent or broken rod, or a cylinder is hydro locked from fluid in the combustion chamber, or its out of time and the pistons are smashed against the valves. Since the oil smells like fuel, lets get the spark plugs out and see if it will crank now.
-----------About me and Just Answer------------
I am in my upper 30's, have a wife and 2 sons. I farm, fish, hunt, build, and coach youth soccer. I work on anything with an engine and have went to many schools and classes to get trained and certified. I try the best I can to share what I know and or have access to with my customers. Please consider I base my questions and answers to you, solely on the information you give me since I am not there to see, smell, hear, touch, or test. I try my best to be here everyday starting at 3pm central. Rating one of the answers, not the questions, you receive is required. Please let me know if your not pleased prior to rating so I can try to help a different way. God Bless and have a great day.