After replacing the carb o my 84 blazer it ran a whole lot better, but every once in awhile I think the module would heat up in the distributor. I opened it up to find out which one I needed 4 promg or five prong, and discovered the weights had oblong holes worn in them. I replaced them and it even ran better, but the module seemed to heat up still so I replaced it and it ran even worse, so I opened it up again and discoveered the weights had overlapped them selves when I put it back together. That fixed with all the other crap, it runs great. hence I should have replaced the distributor in the first place. 240.000 miles on it. especially when you have to climb inside the engine bay to work on it.
Sixball I have my old thermo quad if you still would like to have it to play with.