Inconsistent idling problem

I have read quite a few different threads, but didn't hear the same problem I seem to be facing.

I will give the background that I know it for my vehicle. It is a '67 Dart Convertible GT. Originally came with a 273, but now has a 360 in it. I purchased it in May of this year and have been working through the issues as I find them, and as they rear their ugly heads. I have switched out the points ignition for the Proform Electronic Ignition with the Orange ECU. I have rewired the fusible link so it does not run through the bulkhead connector. I have replaced the 750 Holley Vacuum Secondary (3310) with a Summit Racing 600 Vacuum Secondary. I replaced the Carter Fuel pump with the Edelbrock Fuel pump a couple of months ago. The car has a mild cam (do not know any of the spec's), and a dual plane Weiand manifold on it.

I do not really know if this problem with an inconsistent idle has been with me the whole time I have owned the car, due to the fact that it has so many of the parts changed in the ignition and fuel delivery system over the last 6 months, and has been in and out of my garage and the local garage fixing the inconsistency issues.

The problem I am currently facing is that the car does not idle at a consistent RPM in or out of gear. I have adjusted the fast idle on the choke to run at around 900-1000 rpm on initial start-up, and after it sits over night it will start and run at about 600-700 rpm. I also have adjusted the curb idle to operate around 650-700 rpm, and it will operate at that speed sometimes, and other times it will drop down so low that it stalls (around the 400-450 rpm range). I will adjust the carburetor again, and it will again change. Then I will get to the next stop light, and it will idle around 650-700 rpm, with no rhyme or reason why it wont stay consistent. I am not sure whether this is an ignition problem or a fuel problem, but thinking something in the ignition process is not working right. I also have a strong smell of gasoline when I step on the gas, that will stay around for several minutes after jumping on the throttle. My thinking is my coil may be going out, or my spark plug wires are failing.

So much of the information I have gotten for modifications on the vehicle have come from this web site, and they have been great. Any help would be apprciated.