Engine Question ,Not Chevelle

[flash]

I just bought a truck that has been sitting for many years in a barn and would like to get ideas on what I should do to start it after all this time .I plan to change the oil and filter and clean or change the plugs ,get some fresh gas in it ,replace the belts and hoses especially the fuel lines .What am I missing ? It is a 6 cylinder ,3 speed on the column with 56,000 original miles. Any ideas will be appreciated .Once it reaches its new temporary home I plan to start on it.