Tuning with jets, Power valves and an O2 guage

here are my pennies worth. when you had the 6.5pv it was open at idle then you put in a 3.5pv and it stayed closed. this would be the reason it was way lean and you have the needles to closed. to get it richer at idle open the needles more, about a half turn or so. this will help in the transition from idle to cruise also.
the secondary blades should just be open enough to barely uncover the transition slot. the adjustment screw is under the plate.
pump cam tuning, grab the linkage and open it as quick as you can, if it stumbles go up on nozzle size until it doesn't. now hit the street, stop and in first gear pedal to the floor as fast as you can, if it stumbles go up in nozzle size until it stops.