1967 Mercury Cougar, Restomod, 5.0L, AOD
So, I'm a noob here, but have a few decades of experience (esp when that is what u get when u don't get what u want) with cars having owned 40+. If you really want to examine / alter the EEC-IV tuning and log, get a Moates Quarterhorse and TunerPro RT software. It isn't quite OBD-2 but pretty amazing given the generation. I was going to get the twEECer-RT, but after reading up a bit more, went with the Quarterhorse. When you get your tune set, you can write it to a module and remove the QH. IIRC you can also have 4 tunes loaded to the module and switch between them on the fly.