I have seen this issue more and more lately, more than ever. Or it could be since it's affecting me that I'm noticing it more. The new gas blends seem to be causing many problems.

On my car I have the seethrough plastic filter before the carb, and as I let my car idle I could see hot bubbling fuel in the filter, and the carb was not getting enough fuels to keep the right levels and it died.

I'm currently installing a Carter electric pump to see if that solves it. As far as what I've read, carter recommends a filter BEFORE the pump. And I would run one after it also, which I'm planning to do with the seethrough filter before the carb.

If I were you I'd put a filter before the carb, seethrough plastic, and look at it when it's running hot/crappy vs. when it's relatively cool and running fine. That will tell you a lot.