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As previously stated the carbs will still get heat transfer to them via the attaching method as well as convection from engine heat. As has been stated the carbs will boil over when heated, lets look at this problem. The carb designer built in enough area in the float bowl cavity to allow for the fuel to expand when heated, if the proper float bowl level has been set this problem should not occur. Like I have previously stated I do not run phenolic spacer, I would adjust the float level accordingly. You may have to reduce the float level to get satisfactory results. Here's a little trick to reduce the float level height but increase the float bowl volume:
1) remove the top of the carb
2) remove the gasket between the carb top and bottom
3) look for the little cavity next to the float bowl that has nothing but air in it, opposite side from the accelerator pump piston chamber
4) remove the material between the air cavity and the float bowl, you have just increased your float bowl volume
5) now set your float level lower
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