Hard start

I have a 383 auto in my 67 belvedere. I have a 750 edelbrock ,manuel choke carb and an offenhousen alum intake. This motor is a ***** to start. If it sits for a week I need to pour gas down the carb so it will fire. Even after I have it running and shut it down for a couple of hours it still doesn't start quickly. I tryed a new mini high torque starter,it didn't help. I was told to try a carb spacer.. any ideas?
it does sound like it could be a combination of fuel delivery and choke position