64 Dart 270 ignition struggles

Looks like you don't have a choke at all, so, it probably won't run too good until it fully warms up. I'd do something with the open bowl vent too to keep dirt from going inside. I'm not sure if I'd cap it but, maybe a piece of sponge? I'd also get a proper gasket for the air horn so the air cleaner isn't sitting metal to metal on the carb. After it fully warms up, won't it adjust to where it will idle correctly? IIRC, your carb looks like the V8 version instead of the 6cyl, but, it's hard to tell for sure with the photos you have. The choke connection is slightly different between the 6 and 8, and I'm sure the jetting will be too. I think I actually have a factory choke for that setup. I'd have to check though....