[85RedCarrera]

My ‘75 wasn’t running hot, but had many of your other symptoms. You may have more than one issue.

Regarding hard starting, back fires, etc… Have you looked at the CIS plastic plenum/intake system- done a smoke check? Do you have one of those ridiculous toilet seats inside your air filter box? I used to find mine laying on its side inside the box after a balked start- if you have a pop off valve, and it is leaking, that’s a big problem. They are glued in with epoxy. Usually not very well.