I agree. Try and get it running first. Then determine, what, if anything, is wrong. You may find that all is ok, saving you a bunch of time and money. Plus, if you start tearing stuff apart before you have it running, if it doesn't run after you fool with it, then you won't know if it was a previous problem or something you inadvertently created.
At the end of the day, have fun and good luck.
So there are two reasons I want to rebuild the carb before I start it... 1) Its been sitting for at least 3 years and I figured the gaskets and probably the fuel pump diaphragm are shot. 2) The first thing I did when I started checking out the motor was open up the air filter. I notices a small metal shaving about the size of a fingernail clipping sitting at the bottom of the filter next to the carb hole. When I tried to get it out I knocked it in the hole I know... DUMB MOVE. I might try and see if I can stick a magnet down there and get it out or suck it out with my shop vac with a shirt over the end of the vac so I will know if I got it because it will be stuck to the shirt.