Fuel and ignition revamping (solved?)
I initially set a base timing of 18* with the 18* bushing and heavy silver and light silver springs. 900 ish rpm at idle in park and 800 in drive. I also put the lightest metering springs in the carb.
I haven't looked at the AVS2. Are the metering springs controlling rods that gointo the main jets? if so, that shouldn't effect idle.
The car runs well but when the fans come on at idle in gear it just sounds like it’s off a bit. The Rpms fluctuate and just doesn’t sound right to me. It doesn’t flood or die just again doesn’t sound/feel right. I’ve tried to add some advance and that helps, but then my total timing gets way up there and that kinda scares me.
Between that, and the drop of rpm from 900 to 800, it seems like the load with fans on is just borderline too much.
Have you experimented with richer idle mixtures?
I would first turn the idle mix screws in (leaner) to get a sense of how much control they are providing. Then assuming they have some effect, make them richer. If you can make them rich enough the rpms and/or vacuum at idle drops, then we know they have sufficient control over the idle mix. Set them an 1/8 or a 1/4 turn richer than the current setting and see if the engine can handle the loads at idle a little better.
Do all that at 18* initial.
Then you could test again at 20*, reset the throttle position for 900 rpm in neutral and do the whole test procedure over.
See if its better in gear with the fans on at idle.
If 20* works out better, then you can buy different bushings from crackedback or modify as shown here
MSD-Delco Distributor Weight Modification For Less Advance
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I'm assuming here that the fans are drawing enough current that additional load is from the alternator spinning with a strong magnetic field.
If there is no vac advance on this distributor, then use a pair of equal medium or light springs.
