Been trying to resolve fast / sticking idle issue

ALL SMOG CONTROLS TAKEN OFF BY PAST OWNER
As far as I can tell it’s the original carb

So far I have cleaned the fuel tank
New sending unit
New gas cap
New fuel line front to back
New fuel filter
New carb base gasket (check for leaks with flammable spray)
Cleaned carb twice
All unused vacuum ports capped with NEW caps
Installed distributor properly
Plug wires installed properly
Timing set at 8* btdc at idle
Idle air adjustment done as best I can by ear.

The only issue I can come up with is it seems the plastic accelerator pump body kinda hangs up on its retainer

Any suggestions ? Maybe get older carb pre-smog ?

Thanks !