This may help.
" I'd start with 36mm venturies, 155 mains, 180 A/C's and 55 idles. F3 emulsion tubes are best but they are NLA. Unless you find a good used set, you are stuck with F26's."
Weber jetting 3.0 SC
I too think you are jetted too rich. Try some 55 or 60 idle jets first since your high rpm (main jet) function seems to be fine.
Does the car respond if you turn in the idle mixture screws? It sounds like the car is loading up (way too rich) on the idle circuit.