Idle Transfer Slot on secondaries?

Fuel pressure @6.5, floats adjusted at bottom of window requiring bumping the car to slosh out. Timing is now fully adjustable on the fly as I am running the Progression Distributor. 18° at idle.
Motor is solid flat tappet lifter J heads with double springs. Unknown cam. Pistons 12:1 TRW. Duel plane AL intake.
Note had colder plugs to help with minor detonation and a slow curve all in 32° at 3000. The plugs are now fouled and I need to go hotter than the Autolite 63’s that are in there. Need to probably go back to the Autolite 65’s?

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