600 edelbrock secondary bog.
No and yes but just a tuning change, not an excuse to run out for an 850 yet,lol.
As
KosmicKuda said, your engine is getting a big gulp of air without an appropriate amount of fuel in it.
That carb is an AFB type, so the weighted valve out back is gonna need to be slowed down a tad,or the metering rods lifted faster/higher, or the pumpshot retimed to cover the lean-hole, or the boosters removed and cleaned,together with their fuel and air passages,jets, bleeds and emulsion tubes , or the float level SPECIFICATION you are setting to, verified; or some combination of those, or all of those! lol.
Moving the linkrod up or down the arm, requires the linkrod to be bent to reposition the capacity of the stroke. And the S-link orientation proven.
PS, I'm trying to remember if the secondary side has an advance fuel delivery system, like a transfer slot, but I'm drawing a blank. I think there isn't.
EDIT:Yeah there is. It's operation is shown on page 4 of the owners manual. I think yours is defective or dirty
www.edelbrock.com/automotive/misc/tech-center/carb-faq.shtml
