I would strongly suggest that you drain all of the fuel from the car if the tank has any old gas in it - even with new fresh fuel added, there is very likely enough varnish from the old gas that will accumulate in the valve guides and cause the valve stems to seize, in turn causing at least some bent pushrods. I bought a car that had this happen because the previous owner ran it on old gas just a little bit. Since the car sat so long, you might want to at least take out the fuel sending unit and see how it looks - if there is significant corrosion on that unit, chances are the fuel tank will need cleaning, or you will be driving along one day and the car will sputter and die out due to sediment and rust accumulating in the fuel filter and clogging it.