Need help from the brain trust

I was out for a drive two days ago and while fairly under hard (~3/4 throttle) in 2nd gear the engine started to sound like it blew an exhaust gasket.  I let off the throttle a little to ease the load on the engine and sound when away.  Under light load the engine sound normal.  I believe the noise is coming from the #3 cylinder/exhaust port. Everything else seems normal.

I thought it may a carb sync issue so I played around with the sync link, as it was off a little bit, but it did not make a real change.

I took a video so you can hear the sound, albeit somewhat muffled.

Any ideas?

I really appreciate any thoughts or ideas.

Thanks and I hope you all are staying healthy,

Chris

It's only Money, You'll make More!

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