Motor is hard to start after warm up

Good call on the fuel change 66Dartman.....you are exactly right with the alcohol addition in the winter.....that will also make you run lean along with the cooler air......might need a jet or metering rod adjusment too. Also you need to set your enrichment screws with a vacuum gauge and not by ear......set them so you get the highest amount of manifold vacuum and then put in the metering rod spring that corresponds with the vacuum reading. then you can start playing with metering rods and jets......I had an eddy carb on my car and could never get the stumble out of it.....but my engine is far from stock so I'm sure that has something to do with it.