Starts and shuts off, will not stay running?

I traded for the vehicle listed above, it has the 5.7 in it it’s 4x4 it’s been sitting for 5 or so years because the owner lost the keys, so I traded for it. I popped the ignition out so I could start it with a screwdriver. It would start as long as you kept putting gas in the carburetor from a bottle. So, I ended up ordering a new key switch and a new fuel pump, I didn’t change the filter because I could blow through it. So, long story short it will start by the switch now, but it starts and shuts off.