The first thing to do is clean out the fuel system from front to back.  Hopefully there wasn't any gas left in the tank.  After a year or so, gas goes bad.  It doesn't burn right and smells terrible.  After a few years it dries up and turns into a hard sticky substance that seems to be impervious to any cleaner known to man.
You may have to remove the tank and clean it out (It's not really that hard to remove . . . the cleaning it out part could be, but you may get lucky).  I've had a couple of old bugs that had a stopped up fuel pipe and they are a real pain to clean . . . and they run through the tunnel, so replacing it isn't a good option.
You'll also need to replace all of the rubber fuel hose.  It may look OK from the outside, but a lot of bugs and buses have burnt to crisp because old fuel hoses cracked and started leaking.  There is a section of the hose below the tank, one from the rear fork to the a metal pipe in the engine bay, and one from the other end of that pipe to the fuel pump, and one from the pump to the carb.  Put a filter between the fork and pipe, not the pump and carb.
Since you suspect it was parked because of fuel pump, you might as well replace it while you're at it.  And take the pump apart, clean it and put a kit in it.
Once you have the fuel system up to snuff, change the oil, adjust the valves and put points in it . . . and see what happens.  OH YEAH, GO THROUGH THE BRAKES BEFORE YOU DRIVE IT!!!!