On a hot or warm day, and we have plenty of them during the year, put your hand at the base of the windshield with the engine running and will feel nothing.
Remove the rubber weatherstrip and you will not want to keep your hand there very long.
In the "old days", we would put shims or washers to elevate the rear of the hood to allow heat to escape from the engine compartment as it was sealed there.
When emissions came into affect, the factory wanted more heat under the hood, but us racers did not want the under hood heat, and still do not want it!
The coil pack/module happens to be in the hottest place under the hood, and our 100-110+ degree summer temps was killing these electrical items in the early years, and we quickly learned to remove the weatherstrip, which also removes lots of heat.