Yes you will need a new thermo gasket if you remove the water neck. Just ask the parts guy at the counter. That gasket fits about million vehicles. You won't need o-rings for the injectors. Also you don't have to take the thermostat out of the lower.
I got the gaskets but forgot the RTV Ill pick some up tom, I will try to make it to towers but I might be leaving that day since my dorms open that sat.