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I have done some of this tuning, here was my process.
First: Make sure all 6 injectors are delivering he same amount of fuel. Use 6 cups to capture fuel and measure result in graduated cylineder . Tune/replace parts as needed (I was working with a 78 CIS fuel head which has adjustment for each injector on fuel head.
Adjust fuel pressure thru adjustable regulator: I used wide band to look a A/F ratios as I adjusted. Ended up adjusting control pressure to low end, tweeking mixture at fuel head for correct A/F. Goal was minimum resistance (control pressure) at fuel metering plate (by letting it open easy/farther) but making sure mixture was good.
Final tuning on dyno to get best A/F and ignition advance.
Remember all the factory settings are for compliant emissions not best power.
Dyno is important as butt dyno lies. Car that has good torque down low and flat torque curve will feel slower than can that has poor low end torque but steep slope to max power.
john
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