Going to leave the AFM alone for now. Planning on going through the fuel injection system and testing everything we can, testing vacuum, etc.
Did fine out a few more pieces of info. Haven't verified, but PO says the injectors should be original type, not turbo (we'll see). He did change out the throttle body, as many had observed. He also switched the cam to a Schnieder Racing Cam. I'm not sure exactly what that does or will mean, but one more piece of the puzzle.
My son turned 16 two days ago, so he wanted to get up early and go to Cars and Coffee. Gratuitous pic of him (the one with long hair) next to his car. He had a blast and we had a lot of people stopping to talk. Everyone had one or knew someone who did and have fond memories. Was fun.