One other thing I have been doing over the years is to run the Edelbrock intake gaskets that block the heat crossover on the heads.
I’m now running Edelbrock heads without the heat crossover. Takes a little longer to warm up and idle but in the hot weather it helps a lot.
Looks like you have iron heads?
Might try the other intake gaskets if you aren’t now.
It’s a pain to change them but will help in the heat.