If you cant get it to run how do you know it is timed right? It sure sounds like it needs more advance. Try twisting the distributor ccw in small increments and try starting it. Do the final timing once it is running well.
Two other thoughts, are you 100% certain that the cam is properly installed and degreed?
When it is running, if you look down the carb throat do you see fuel dribbling out the venturis? You should not see any.
Good luck!
