Sorry i can't help too much at the moment.
i had the exact same problem on a 2G reman. Most remans are not really that good. i went to the junkyard to get a factory inlet and problem solved.
If it has to be new, then a holley 2300 may sort of bolt in with an adapter.
Or get a high quality reman from a more reputable rebuilder.
Or get a new intake---then you'll have plenty of new 4bbl carbs to choose from
i'll try to add more later.
P.S.
If it's leaking,
DON'T RUN IT.