I am not familiar in a working sense with the progressives, but I've had a lot of weber experience doing my VW. If by "bogs" you mean "almost falls flat on its face", then I think I would stick on the carb track of suspicion. Possible idle/main overjetting, and very rarely pump jet issues. On the other hand, a mild sputter at the RPM range where you say may be indicative of an igition problem. yes, electronic will help it along with a better and stronger spark so you won't notice the "sputter" anymore. But if it truly is a carb jetting issue, all electronic ignition is going to do is make the bogging sound a little smoother
Take your time and it'll work out. I think anyone here that uses their truck for anything more than backyard runs should switch over. Its a beutiful thing.