This is not a boom vang. The boom vang is attached to the boom further forward and goes to a point on the mast, and is used to control how high the boom lifts when it is let out for reaching and running. All you've got is a mainsheet—no more, no less.
Often, the cam cleat setup can be reversed, so that instead of pulling down to uncleat, you can pull up to uncleat. Usually, two or four screws have to be removed to do this.
Another option is to change the angle the cleat mounting plate is at, to give you more clearance. Again, this is usually done by removing several screws and then making the adjustment and then replacing the screws.
Personally, I think that the mainsheet should be pulled up to release, since it is generally easier to pull it upwards to free it, than it is to pull it downwards to do so.. and generally the main sheet can be freed from more angles and at a greater distance than if you have to pull down.
If the block is such that you can't modify the way it works, you can always buy another block that does. This block is upside down for the application you'd have... but you can see that it would release upwards. From this website
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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