Brad Anders Djet site offers the following info Thanks Brad.
74 has 5 waveform generators in the speed control circuit and no overrun shutoff while 75-76 has overrun shutoff and 4 waveform generators.
What does that mean functionally?
OK helped my self on the overrun circuit. Emissions control to inhibit injector pulses when throttle closed and engine speed is over idle.
Looking for answer to wafeform question now.
Which would offer more features in a car that needed to maintain original FI. Would a change materially affect resale?
Please no SWAG, no internet hearsay.
Carlos