As stated in earlier posts:
carb- remove top and check for dirt, replace and install an inline fuel filter (see through)

vacuum leak: tighten the carburator, look for crack in carb spacer, look for vacuum leaks (remember the vacuum line to the windshield wipers) I spray carburator cleaner around the vacuum openings on a cold engine (not recomended by many, but it works for me)

Fuel pump: remove the line and check for flow while cranking engine (remove coil wire for safety)

your problem sounds like it is starving for gas or has too much air (vacuum leak) Have you tried to feed it gas while you had someone turning it over? If it will run while you feed it gas, then the problem is in the carb or fuel pump. Good luck ..g