Starting a long sitting engine.

Start by changing all the fluids/filters gas included, inspecting all rubber, and of course shoot some oil in the cylenders and prime it for starters. flush the cooling system with the thermostat out. If you can pressure test the coolant system also, copper heater cores and freeze out plugs also seem to have a habit of crapping out after sitting a long time. Do it after flushing and before new coolant.