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Exactly. If he's at 34° at 3k the mechanical advance is just about maxed out if he's using the 18° slots. Using that setting there will be little, if any, more advance between 3k and 5k based on his initial/mechanical setup.
4429's don't use manifold vacuum for the advance, only ported. Mine runs fine with timing at 18/18. I cured a slight off idle stumble with my AVS2 by swapping the stock Edelbrock discharge nozzles with a spare one from a parts 4429. The necked down tubes were too restrictive for the needed flow.
Just picked up a '78 Bally Playboy. Decent original needing only a new mpu board, rubbers, and cleaning. Pretty much the same build quality as my '58 Seeburg 201. Love the old school stuff.
The mounting should be the same, but the '69 may have the o-ring type fitting for the pressure hose vs. the flared fitting on '68-down. You may want to confirm that.
Sounds like the secondaries may not be fully closing. When it hangs up in high idle, manually verify that the secondaries are fully seated and see if it changes anything or stays the same.
Logically thinking, I would rather have my choke pulling open and being held open by mechanical means rather than hoping it opens by gravity, especially if there is any dirt, debris, or corrosion in the choke shaft preventing any free movement. I can honestly say I have never had any choke...
The op's choke has the bracket above the coil tang. Mine has the bracket below the tang and the keyed end of the choke rod is above the tang, sandwiching it. This ensures that the rod travels with whatever position the coil is in, hot or cold. Been working perfectly that way for nearly the 40...
Take a look at your choke assemblies when you get home, while holding it, heat it up until the rod drops all the way down, then see what happens when you try to pull it back up with the coil fully expanded.