Percolation? Heat soak? Don't drive during summer??
Here are the pictures of the heat shield I use. I’ve used several of them. I had forgotten that I took pictures of it.
It won’t fix all of it, because when the ambient temp is high enough, it will still boil some of the fuel off when you shut it down. But it will stop most of it.
No other spacers or heat shields ever did anything but this one. The first time I used it was on a 67 Firebird with a cast iron intake and Q-jet. He spent a bunch of money and the only thing that helped was this.