No, I got the spring in the inlet. This is IN the filter. My carb uses the short 1” paper filters. These are available with or without a check valve internal to the filter. There’s a small piston and spring. Not sure what the point of the valve is... but it would certainly restrict fuel flow a bit.
Also... I bogged again. This time I stopped at a convenience store, left the truck running while I ran in for a Coke, and then pulled out and normally accelerated to about 45. Lost power for maybe two seconds, then it caught itself and off we went. No hill, completely flat. Did not accelerate aggressively. Just moseying along. Didn’t happen the rest of the day.
Of note, and possibly related... today and the day I ended up on the side of the interstate have been exceptionally hot. Not sure if that could make symptoms appear or not...