Strombergs have a habit of leaking petrol from the O-ring seal at the bottom of the float chamber - does your leakage smell of fuel? Admit it looks like oil from the pic, and seems to be coming from the carb-to-manifold join.
Could you be over-filling the ATF in the dashpot? You have to leave enough space for the screw-in plunger otherwise it will force excess out. Does your car smoke a bit when first started - as if oil is getting into the manifold then engine?
If you do need to check that bottom O-ring it is frankly easier if the carb is removed from the car (4 nuts) as it probably means removing the float chamber from the bottom. The seal is at the bottom, to prevent the contents from leaking (not a good design), however some models of cars have a decent-fitting plug there - still, a look will give the opportunity to clean it out of the almost-certain crud the fuel filter hasn't caught.
P
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