Should be fine ,. Kept it low and used stabil since I changed the tank a couple years ago. Most of what's in there now is not more than a few months old. Certainly very burnable. I figured I would be retuning through the first couple tanks anyway.
Ok, paint by numbers then...start with the plugs (pull and check/clean as necessary) check timing and then adjust carb. Set kick down linkage properly and then drive it to burn everything out, new fuel, then repeat carb adjustments. :)