heat soak

I've seen many threads about these things and nothing with real experience and data; only a myriad of baseless one line opinions. I'd be happy for more opinions to supplement my little journey here. Bear in mind I'm not worried about looks as I have hacked many a thing from mine and have been...

Noticed issues a couple times withe rough start after engine is hot. It is summer in FL too. Im going to replace the plugs just because I have yet to do so. Want to add the heat shield for the #3 injector as it sounds like that is the problem. Any idea where i can buy it and what its called?