fuel pump draining back to tank

Here is my non scientific observation and poll. I have been working on quite a few mopars at my place over the last few years and noticed the cars with Carter or Edelbrock carb's after running stink up the garage for a couple days due to evaporation and are hard to start due to dry carb's after a few days. The cars with Holley carb's don't smell and restart easy weeks later. So at a car show with a number of Mopar owners there I did a survey and found the same results.