It's been a very long time since I've seen one but I'm wondering if the ais for a log style
throttle body can be used in a 87 up T1 throttle body. On my engine test stand I'm using the later style intake which uses the four wire stepper style ais and an 1985 T1 LM, so I'm pretty sure idle air isn't being controlled. If the 85 ais will work I can use a different plug with the same wiring convention.