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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.