I had two Edelbrock carbs on two different engines and they both vapor locked in the summer and they both had sticky accelerator pumps. It seems to me that the aluminum bodies not only cool down quicker but also heat up more. Also, both accelerator pump seals dug into the soft aluminum accelerator pump cylinders, causing the throttles to feel jerky. After less than a year of use, I threw both relatively new carbs in the trash can and bought a couple of holleys and had no more carb problems for the last 5 years.
Edelbrock makes great intakes but they should be embarrassed about that carb. They are selling a cheaply made carb for little money, and in this case, you get what you pay for. It looks like they decided to spend more money on advertisement than building a better carb.
If you don't what a Holley than get a Q-jet. But stay away from edelbrock/carter carbs.