https://youtu.be/D8b1bgvN0i8

This has shown up recently. Thoiggt it was radio static.  Got less when i pushed accel, sort of disappears,   i heard it at dump when i got out one day, pulled off air cleaner.  The video is kinda harsh because i hqd it very close to carb.  You can hear when i tap accel rod, it quits.  Its sounds loke a whistle.  Any thoughts?

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Also,  at low speeds, it kind of is non existent, like slow crusin in town,  this mainly happens on the road.  

I had the exact same problem. It would come & go but seemed to be related to engine temperaure. Turns out it was an intake manifold gasket leak. The gaskets were the thin metal type. I replaced them with Best 14046E (https://vintagecarburetorsandgaskets.com/shop/intake-manifold-set-1...) which are thicker non-metal gasket material. Solved my problem.

Here's is the whistle. https://drive.google.com/file/d/10RgTbdSpvkc-5TbMoObfhO7NFzNmgHk8/v...

Wow,  thats identical!  Thanks

It was intake manifold gasket.  I chged it while back and it disappeared

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