You need to see if there is fuel going into the throat when throttle is cycled. Using starting fluid seems to indicate no fuel squirting. Which is why the others have said accel pump and float level. First see if you have fuel entering the throat. It might be a dribble. Need good flashlight. There are entire Youtubes on rebuilding a B1. If it ran fairly good before, then it's something you did or did not do. Stay with it, it's your first build. Start over, look at the videos. Check the parts list for every little part, ball, correct gasket and correct gasket orientation, oil the accel pump leather and be sure all parts are there and not on the floor. Make sure all holes in intake manifold are either plugged or used.
