Proteus uses GPPWM to tell HEI who is in charge - below say 300 RPM it's HEI doing cranking timing and above 300 it's rusEFI doing timing.
channel 1 tach signal - purple wire with a white trace - pin R
channel 2 coil tach output
channel 3 ignition override - tan wire with a black trace - pin B
channel 4 advance control - white wire - pin E
Here HEI is in charge (channel #3 on the image is low)
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