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Since your airbox already has a valve installed, I agree with the remove, clean, and put back in with adhesive advice. It might be worth double checking that the airbox is still intact at the seams. Check the screws to see if they are still tight. If they are not, then the box likely has been blown at some point along the seams and you will want to replace it.
I chased CIS leaks etc. for a year or so after first getting my '82SC. After fiddling around and never getting the car to run perfectly, I elected to completely dismantle the CIS system and inspect, test, repair, replace every single component. When it came to the airbox, my old one had a loose pop off valve and also loose screws around the seams. I bought a new box but DID NOT install a pop off valve. If you system, hoses, devices, etc. are all working properly and the CIS is tuned, the car will not backfire. In fact, what can happen over time is that pop off valves become loose, introduce unmetered air, and actually create a backfire that might then blow the box if it's a big one.
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