slant six cranks but won't start

Ok I will try these thank you by the way we are just pouring the gas into the carb do not have gas inn the tank yet

It's generally not a good idea to pour too much gas into a carb. Unless the engine starts, most if it goes right through and washes the cylinder walls of lubrication. If done while cranking, a backfire will ignite your container and someone will get hurt. If it doesn't at least fire a little with a shot of starting fluid, look elsewhere.