Trouble starting 72 pickup

[colyank]

Having trouble starting my 72 Chevy Pickup lately and can’t seem to figure out what the problem is. I had the truck running smoothly about 6 months ago after I had rebuilt the carburetor. About last month it has had lots of trouble starting and it took dumping gas into the carb to be able to start it and then had lots of trouble staying running. Now it won’t even start, I took apart the carb again and made sure everything was good, didn’t make a difference. NNext I’m going to try checking all 8 spark plugs to see if that could be the problem. It kinda sounds like while it trying to start and run, there’s some type of timing issue while cranking on it. Anyone have any idea on what could be wrong?