Car is a 70T w/Zeniths

I am getting some popping when decelerating that is getting Louder as of late and thinking the exhaust leak that I have behind the lower point of this bracket (see pic) is the issue. The bracket is no longer connected at this point. I hope this is the only leak but will be checking for others this wknd.

Also aware that this may be a carb issue (comments welcome).

What is the best product/procedure to repair a hole like this?

Thanks

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