Need help with my slant six

The gas is not all that old. I put it in the shed just for the winter probably around November. I have already taken the fuel line off and cranked it and it pumps plenty of gas out so that is why I believe it is getting fuel. The gas smells normal and just like it usually does. I have not checked the spark yet I'll do that first thing tomorrow and see if that is it. Thanks for the help!