I can see yer problem right off, yes.
The top plate is bent, missing a screw and yer gasket is probably torn.
Don't take this as gospel, but yannow...I think that's an old Gutrner carb.
And I know just where to get the parts for it, if it is.
Select MOTOBECANE, and scroll down and have a look at those carbs.
Damn me, but your's seems a dead ringer for model "C" of them.
They also have a page of em part-by-part
So, it looks like you can get the parts and all...I would call them about it.
See how much help postin a pic of the problem can be ?