Eddy 1407
I guess it might be time to scrap the carb. maybe a Holley?
I mean no disrespect by this, but its guys like you who give these carbs a bad reputation.
Ive seen this time in an time out. You barely know how to time a motor, and its the carbs fault ?
You are throwing jets, rods,springs at this thing without any idea why ? Eddys are the easiest carbs to tune.
If you think you are going to just slap a holley on and magically haul balls down the street, your fooling yourself.
Time for you to read and learn about carbs, timming, vacuum leaks, valve adjustment,compression, ect.
Having said that, I would start by putting the Eddy back to the way it came from the factory.
Stock jets, springs, rods. This will be the best starting point.
Kind of sounds like you have a vacuum leak somewhere. Use a new base gasket for the carb so there is no vacuum leak between the carb and manifold. Eventually you will want to use a phenolic type spacer.
Take the vacuum advance out of the equasition. You could have a blown vacuum pod, and not even realize it.
Cap both ports on the carb, and tune it without the vacuum advance. Some people run their cars without vacuum advance, just leave it unplugged for now. But make sure you plug the 2 ports on the carb with Good, new caps.
Again.....Read and learn.
In fact, bounce on over to YouTube. There are some great tunning Edelbrock videos over there.