6 PACK CENTER CARB FIND BUT?

the metering block i have #6625 has that vac port you indicated, also below that is a brass adjustment screw which is on the other side also
I'm leaning towards the base plate, metering block, fuel bowl was installed on a 4782 body Chicago carb has exploded views on their website, will print them out so I will know what parts I'm talking about (thanks 72Dart6pack) then will call Al @ chicago carb
Thanks to both of you