blocking off the heat risers?

[37fordtruckguy]

while working on my truck with my grandfather he was telling me that since I have a aluminum intake manifold I don't need the heat risers because it transfers heat better than cast iron. I know that they were meant for preventing the carbs from iceing over in a cold climate, but it barely get below the 40's even during winter. My question is what are the drawbacks and advantages? Other than it being more raspy sounding from what I heard.