I'd start by looking at the choke.
I have already taken the top of the carb off and checked it. everything is where is is supposed to be. And the jar thing is a good idea. I will try it. I can also post some pictures in the morning.It sounds to me like it might be running out of gas. Like the carb bowl has enough to get it started, but then it can't keep up.
I'd unplug the hose from the carb and run it into a jar and then start the car (or at least turn it over) and see if it shoots a good amount of gas out into the jar.
Maybe change the gas filter again.
And pop the top of the carb off (assuming it's an 1100) and check that the float is ok and the needle valve's adjusted and the seat's not gummed up.
Just so we all know what we're looking at, what kind of carb do you have and what kind of gas filter and fuel pump, etc? Everybody like pictures too if you can grab some.
^^^^^^ +1WTF is the fuel filter to the LEFT of the carb hooked to??? '65 fuel pump should have an attached canister filter and steel hard line to the carburetor. Also check that you're not sucking air into the hole in the intake manifold spacer directly below the carburetor mounting nut you can see in the photo.