Adjusting the accelerator pump on an Edelbrock is one of the last tuning steps, so it usually won't make much difference on a stock carburetor.
For an Edelbrock the general tuning process is:
- check the float setting, and verify that you have no more than 5 psi fuel pump pressure
- set the idle mixture (just gets it running smooth)
- swap jets and rods to get the AFR you want for cruise and power modes
- use a kit to swap the step up springs and get a smooth transition from cruise to power (this should get rid of any part throttle bog)
- then adjust accelerator pump, if needed for a little more pump shot
- verify that the choke is working correctly
If you don't have new jets and rods, you can still usually fix a lean bog transition with higher (number) step-up springs. The higher number spring means it will transition to power mode sooner, which means you get the richer power mixture sooner. The accelerator pump adjustment by itself is very unlikely to fix a lean bog.
I tried tuning an Edelbrock 1406. However, I was not happy with the results measured with my wideband AFR, so I rebuilt a mid-eighties truck Quadrajet with a kit from Cliff's Performance. The Quadrajet consistently shows a much better AFR on my meter, and starts and runs very smoothly. My Quadrajet is from an '86 1 ton C30, so it is one of the last carbs with no electric or electronic controls.
Bruce