Starts but dies

Check your fuel pump relay, fuel pump fuse, and (the most likely cause) check your fuel filter. Clogged fuel filter will cause this problem and is a very cheap and easy fix. Doesn't hurt to grab a volt meter and check the relay before you pull the filter.

Here is what my 73 is doing starts and then dies thought it was a fuel problem but it is the ignition when you let off the key after starting it there is a dead spot if you turn it just right it will stay running